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Finding the Fourth Proportional to 390,007.55, 538,160.92 and 228,803.78

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Solution

The fourth proportional to 390,007.55, 538,160.92 and 228,803.78 is: 315,720.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,007.55 : 538,160.92 = 228,803.78 : x
  2. Step 2: Convert to fraction form
    390,007.55/538,160.92 = 228,803.78/x
  3. Step 3: Cross multiply
    390,007.55x = 538,160.92 × 228,803.78
  4. Step 4: Simplify right side
    390,007.55x = 123,133,253,517.67
  5. Step 5: Solve for x
    x = 123,133,253,517.67/390,007.55
  6. Step 6: Final answer
    x = 315,720.18

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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.