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Finding the Fourth Proportional to 89,618.40, 123,703.20 and 65,512.80

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Solution

The fourth proportional to 89,618.40, 123,703.20 and 65,512.80 is: 90,429.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,618.40 : 123,703.20 = 65,512.80 : x
  2. Step 2: Convert to fraction form
    89,618.40/123,703.20 = 65,512.80/x
  3. Step 3: Cross multiply
    89,618.40x = 123,703.20 × 65,512.80
  4. Step 4: Simplify right side
    89,618.40x = 8,104,143,000.96
  5. Step 5: Solve for x
    x = 8,104,143,000.96/89,618.40
  6. Step 6: Final answer
    x = 90,429.45

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1.5x scale

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.