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Finding the Fourth Proportional to 89,963.80, 134,945.70 and 86,124.40

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Solution

The fourth proportional to 89,963.80, 134,945.70 and 86,124.40 is: 129,186.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,963.80 : 134,945.70 = 86,124.40 : x
  2. Step 2: Convert to fraction form
    89,963.80/134,945.70 = 86,124.40/x
  3. Step 3: Cross multiply
    89,963.80x = 134,945.70 × 86,124.40
  4. Step 4: Simplify right side
    89,963.80x = 11,622,117,445.08
  5. Step 5: Solve for x
    x = 11,622,117,445.08/89,963.80
  6. Step 6: Final answer
    x = 129,186.60

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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.