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Finding the Fourth Proportional to 387,394.16, 534,617.64 and 215,315.55

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Solution

The fourth proportional to 387,394.16, 534,617.64 and 215,315.55 is: 297,143.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,394.16 : 534,617.64 = 215,315.55 : x
  2. Step 2: Convert to fraction form
    387,394.16/534,617.64 = 215,315.55/x
  3. Step 3: Cross multiply
    387,394.16x = 534,617.64 × 215,315.55
  4. Step 4: Simplify right side
    387,394.16x = 115,111,491,196.30
  5. Step 5: Solve for x
    x = 115,111,491,196.30/387,394.16
  6. Step 6: Final answer
    x = 297,143.08

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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.