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Finding the Fourth Proportional to 65,805.60, 98,685.04 and 21,424.08

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Solution

The fourth proportional to 65,805.60, 98,685.04 and 21,424.08 is: 32,128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,805.60 : 98,685.04 = 21,424.08 : x
  2. Step 2: Convert to fraction form
    65,805.60/98,685.04 = 21,424.08/x
  3. Step 3: Cross multiply
    65,805.60x = 98,685.04 × 21,424.08
  4. Step 4: Simplify right side
    65,805.60x = 2,114,236,191.76
  5. Step 5: Solve for x
    x = 2,114,236,191.76/65,805.60
  6. Step 6: Final answer
    x = 32,128.51

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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.