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Finding the Fourth Proportional to 98,128.80, 147,371.40 and 85,881.60

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Solution

The fourth proportional to 98,128.80, 147,371.40 and 85,881.60 is: 128,978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,128.80 : 147,371.40 = 85,881.60 : x
  2. Step 2: Convert to fraction form
    98,128.80/147,371.40 = 85,881.60/x
  3. Step 3: Cross multiply
    98,128.80x = 147,371.40 × 85,881.60
  4. Step 4: Simplify right side
    98,128.80x = 12,656,491,626.24
  5. Step 5: Solve for x
    x = 12,656,491,626.24/98,128.80
  6. Step 6: Final answer
    x = 128,978.36

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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.