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Finding the Fourth Proportional to 90,431.80, 135,647.70 and 86,592.40

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Solution

The fourth proportional to 90,431.80, 135,647.70 and 86,592.40 is: 129,888.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,431.80 : 135,647.70 = 86,592.40 : x
  2. Step 2: Convert to fraction form
    90,431.80/135,647.70 = 86,592.40/x
  3. Step 3: Cross multiply
    90,431.80x = 135,647.70 × 86,592.40
  4. Step 4: Simplify right side
    90,431.80x = 11,746,059,897.48
  5. Step 5: Solve for x
    x = 11,746,059,897.48/90,431.80
  6. Step 6: Final answer
    x = 129,888.60

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1.5x scale

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.