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Finding the Fourth Proportional to 390,607.98, 539,043.30 and 229,469.82

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Solution

The fourth proportional to 390,607.98, 539,043.30 and 229,469.82 is: 316,670.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,607.98 : 539,043.30 = 229,469.82 : x
  2. Step 2: Convert to fraction form
    390,607.98/539,043.30 = 229,469.82/x
  3. Step 3: Cross multiply
    390,607.98x = 539,043.30 × 229,469.82
  4. Step 4: Simplify right side
    390,607.98x = 123,694,169,023.21
  5. Step 5: Solve for x
    x = 123,694,169,023.21/390,607.98
  6. Step 6: Final answer
    x = 316,670.87

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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.