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Finding the Fourth Proportional to 98,859.60, 147,943.80 and 90,565.20

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Solution

The fourth proportional to 98,859.60, 147,943.80 and 90,565.20 is: 135,531.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,859.60 : 147,943.80 = 90,565.20 : x
  2. Step 2: Convert to fraction form
    98,859.60/147,943.80 = 90,565.20/x
  3. Step 3: Cross multiply
    98,859.60x = 147,943.80 × 90,565.20
  4. Step 4: Simplify right side
    98,859.60x = 13,398,559,835.76
  5. Step 5: Solve for x
    x = 13,398,559,835.76/98,859.60
  6. Step 6: Final answer
    x = 135,531.20

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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.