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Finding the Fourth Proportional to 878,133.40, 1,317,200.10 and 345,671.80

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Solution

The fourth proportional to 878,133.40, 1,317,200.10 and 345,671.80 is: 518,507.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,133.40 : 1,317,200.10 = 345,671.80 : x
  2. Step 2: Convert to fraction form
    878,133.40/1,317,200.10 = 345,671.80/x
  3. Step 3: Cross multiply
    878,133.40x = 1,317,200.10 × 345,671.80
  4. Step 4: Simplify right side
    878,133.40x = 455,318,929,527.18
  5. Step 5: Solve for x
    x = 455,318,929,527.18/878,133.40
  6. Step 6: Final answer
    x = 518,507.70

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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.