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Finding the Fourth Proportional to 98,987.60, 148,135.80 and 90,693.20

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Solution

The fourth proportional to 98,987.60, 148,135.80 and 90,693.20 is: 135,723.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,987.60 : 148,135.80 = 90,693.20 : x
  2. Step 2: Convert to fraction form
    98,987.60/148,135.80 = 90,693.20/x
  3. Step 3: Cross multiply
    98,987.60x = 148,135.80 × 90,693.20
  4. Step 4: Simplify right side
    98,987.60x = 13,434,909,736.56
  5. Step 5: Solve for x
    x = 13,434,909,736.56/98,987.60
  6. Step 6: Final answer
    x = 135,723.16

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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.