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Finding the Fourth Proportional to 356,521.40, 534,781.95 and 86,648.10

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Solution

The fourth proportional to 356,521.40, 534,781.95 and 86,648.10 is: 129,972.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    356,521.40 : 534,781.95 = 86,648.10 : x
  2. Step 2: Convert to fraction form
    356,521.40/534,781.95 = 86,648.10/x
  3. Step 3: Cross multiply
    356,521.40x = 534,781.95 × 86,648.10
  4. Step 4: Simplify right side
    356,521.40x = 46,337,842,063.66
  5. Step 5: Solve for x
    x = 46,337,842,063.66/356,521.40
  6. Step 6: Final answer
    x = 129,972.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.