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Finding the Fourth Proportional to 132,386.40, 198,349.20 and 85,615.20

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Solution

The fourth proportional to 132,386.40, 198,349.20 and 85,615.20 is: 128,273.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,386.40 : 198,349.20 = 85,615.20 : x
  2. Step 2: Convert to fraction form
    132,386.40/198,349.20 = 85,615.20/x
  3. Step 3: Cross multiply
    132,386.40x = 198,349.20 × 85,615.20
  4. Step 4: Simplify right side
    132,386.40x = 16,981,706,427.84
  5. Step 5: Solve for x
    x = 16,981,706,427.84/132,386.40
  6. Step 6: Final answer
    x = 128,273.80

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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.