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Finding the Fourth Proportional to 86,737.20, 130,019.40 and 39,908.40

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Solution

The fourth proportional to 86,737.20, 130,019.40 and 39,908.40 is: 59,822.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,737.20 : 130,019.40 = 39,908.40 : x
  2. Step 2: Convert to fraction form
    86,737.20/130,019.40 = 39,908.40/x
  3. Step 3: Cross multiply
    86,737.20x = 130,019.40 × 39,908.40
  4. Step 4: Simplify right side
    86,737.20x = 5,188,866,222.96
  5. Step 5: Solve for x
    x = 5,188,866,222.96/86,737.20
  6. Step 6: Final answer
    x = 59,822.85

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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.