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Finding the Fourth Proportional to 87,255.64, 120,417.84 and 65,706.80

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Solution

The fourth proportional to 87,255.64, 120,417.84 and 65,706.80 is: 90,679.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,255.64 : 120,417.84 = 65,706.80 : x
  2. Step 2: Convert to fraction form
    87,255.64/120,417.84 = 65,706.80/x
  3. Step 3: Cross multiply
    87,255.64x = 120,417.84 × 65,706.80
  4. Step 4: Simplify right side
    87,255.64x = 7,912,270,929.31
  5. Step 5: Solve for x
    x = 7,912,270,929.31/87,255.64
  6. Step 6: Final answer
    x = 90,679.19

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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.