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Finding the Fourth Proportional to 86,897.65, 130,438.65 and 76,966.87

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Solution

The fourth proportional to 86,897.65, 130,438.65 and 76,966.87 is: 115,531.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,897.65 : 130,438.65 = 76,966.87 : x
  2. Step 2: Convert to fraction form
    86,897.65/130,438.65 = 76,966.87/x
  3. Step 3: Cross multiply
    86,897.65x = 130,438.65 × 76,966.87
  4. Step 4: Simplify right side
    86,897.65x = 10,039,454,617.53
  5. Step 5: Solve for x
    x = 10,039,454,617.53/86,897.65
  6. Step 6: Final answer
    x = 115,531.95

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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.