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Finding the Fourth Proportional to 390,140.50, 538,437.72 and 220,385.56

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Solution

The fourth proportional to 390,140.50, 538,437.72 and 220,385.56 is: 304,156.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,140.50 : 538,437.72 = 220,385.56 : x
  2. Step 2: Convert to fraction form
    390,140.50/538,437.72 = 220,385.56/x
  3. Step 3: Cross multiply
    390,140.50x = 538,437.72 × 220,385.56
  4. Step 4: Simplify right side
    390,140.50x = 118,663,898,447.32
  5. Step 5: Solve for x
    x = 118,663,898,447.32/390,140.50
  6. Step 6: Final answer
    x = 304,156.83

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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.