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Finding the Fourth Proportional to 387,489.33, 534,718.53 and 215,406.90

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Solution

The fourth proportional to 387,489.33, 534,718.53 and 215,406.90 is: 297,252.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,489.33 : 534,718.53 = 215,406.90 : x
  2. Step 2: Convert to fraction form
    387,489.33/534,718.53 = 215,406.90/x
  3. Step 3: Cross multiply
    387,489.33x = 534,718.53 × 215,406.90
  4. Step 4: Simplify right side
    387,489.33x = 115,182,060,919.86
  5. Step 5: Solve for x
    x = 115,182,060,919.86/387,489.33
  6. Step 6: Final answer
    x = 297,252.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.