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Finding the Fourth Proportional to 98,419.20, 147,475.20 and 85,209.60

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Solution

The fourth proportional to 98,419.20, 147,475.20 and 85,209.60 is: 127,681.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,419.20 : 147,475.20 = 85,209.60 : x
  2. Step 2: Convert to fraction form
    98,419.20/147,475.20 = 85,209.60/x
  3. Step 3: Cross multiply
    98,419.20x = 147,475.20 × 85,209.60
  4. Step 4: Simplify right side
    98,419.20x = 12,566,302,801.92
  5. Step 5: Solve for x
    x = 12,566,302,801.92/98,419.20
  6. Step 6: Final answer
    x = 127,681.42

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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.