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Finding the Fourth Proportional to 91,390.40, 136,891.20 and 59,897.60

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Solution

The fourth proportional to 91,390.40, 136,891.20 and 59,897.60 is: 89,718.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,390.40 : 136,891.20 = 59,897.60 : x
  2. Step 2: Convert to fraction form
    91,390.40/136,891.20 = 59,897.60/x
  3. Step 3: Cross multiply
    91,390.40x = 136,891.20 × 59,897.60
  4. Step 4: Simplify right side
    91,390.40x = 8,199,454,341.12
  5. Step 5: Solve for x
    x = 8,199,454,341.12/91,390.40
  6. Step 6: Final answer
    x = 89,718.99

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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.