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Finding the Fourth Proportional to 89,630.40, 123,800.80 and 65,719.20

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Solution

The fourth proportional to 89,630.40, 123,800.80 and 65,719.20 is: 90,773.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,630.40 : 123,800.80 = 65,719.20 : x
  2. Step 2: Convert to fraction form
    89,630.40/123,800.80 = 65,719.20/x
  3. Step 3: Cross multiply
    89,630.40x = 123,800.80 × 65,719.20
  4. Step 4: Simplify right side
    89,630.40x = 8,136,089,535.36
  5. Step 5: Solve for x
    x = 8,136,089,535.36/89,630.40
  6. Step 6: Final answer
    x = 90,773.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.