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Finding the Fourth Proportional to 387,298.91, 534,461.80 and 215,212.43

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Solution

The fourth proportional to 387,298.91, 534,461.80 and 215,212.43 is: 296,987.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,298.91 : 534,461.80 = 215,212.43 : x
  2. Step 2: Convert to fraction form
    387,298.91/534,461.80 = 215,212.43/x
  3. Step 3: Cross multiply
    387,298.91x = 534,461.80 × 215,212.43
  4. Step 4: Simplify right side
    387,298.91x = 115,022,822,720.17
  5. Step 5: Solve for x
    x = 115,022,822,720.17/387,298.91
  6. Step 6: Final answer
    x = 296,987.21

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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.