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Finding the Fourth Proportional to 390,760.52, 539,278.49 and 218,695.73

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Solution

The fourth proportional to 390,760.52, 539,278.49 and 218,695.73 is: 301,816.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,760.52 : 539,278.49 = 218,695.73 : x
  2. Step 2: Convert to fraction form
    390,760.52/539,278.49 = 218,695.73/x
  3. Step 3: Cross multiply
    390,760.52x = 539,278.49 × 218,695.73
  4. Step 4: Simplify right side
    390,760.52x = 117,937,899,253.98
  5. Step 5: Solve for x
    x = 117,937,899,253.98/390,760.52
  6. Step 6: Final answer
    x = 301,816.32

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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.