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Finding the Fourth Proportional to 86,521.80, 129,782.70 and 62,902.20

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Solution

The fourth proportional to 86,521.80, 129,782.70 and 62,902.20 is: 94,353.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,521.80 : 129,782.70 = 62,902.20 : x
  2. Step 2: Convert to fraction form
    86,521.80/129,782.70 = 62,902.20/x
  3. Step 3: Cross multiply
    86,521.80x = 129,782.70 × 62,902.20
  4. Step 4: Simplify right side
    86,521.80x = 8,163,617,351.94
  5. Step 5: Solve for x
    x = 8,163,617,351.94/86,521.80
  6. Step 6: Final answer
    x = 94,353.30

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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.