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Finding the Fourth Proportional to 518,381.90, 777,572.85 and 219,200.30

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Solution

The fourth proportional to 518,381.90, 777,572.85 and 219,200.30 is: 328,800.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,381.90 : 777,572.85 = 219,200.30 : x
  2. Step 2: Convert to fraction form
    518,381.90/777,572.85 = 219,200.30/x
  3. Step 3: Cross multiply
    518,381.90x = 777,572.85 × 219,200.30
  4. Step 4: Simplify right side
    518,381.90x = 170,444,201,991.86
  5. Step 5: Solve for x
    x = 170,444,201,991.86/518,381.90
  6. Step 6: Final answer
    x = 328,800.45

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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.