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Finding the Fourth Proportional to 878,133.90, 1,317,200.85 and 345,672.30

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Solution

The fourth proportional to 878,133.90, 1,317,200.85 and 345,672.30 is: 518,508.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,133.90 : 1,317,200.85 = 345,672.30 : x
  2. Step 2: Convert to fraction form
    878,133.90/1,317,200.85 = 345,672.30/x
  3. Step 3: Cross multiply
    878,133.90x = 1,317,200.85 × 345,672.30
  4. Step 4: Simplify right side
    878,133.90x = 455,319,847,381.46
  5. Step 5: Solve for x
    x = 455,319,847,381.46/878,133.90
  6. Step 6: Final answer
    x = 518,508.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.