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Finding the Fourth Proportional to 65,840.80, 98,712.60 and 28,370.20

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Solution

The fourth proportional to 65,840.80, 98,712.60 and 28,370.20 is: 42,534.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,840.80 : 98,712.60 = 28,370.20 : x
  2. Step 2: Convert to fraction form
    65,840.80/98,712.60 = 28,370.20/x
  3. Step 3: Cross multiply
    65,840.80x = 98,712.60 × 28,370.20
  4. Step 4: Simplify right side
    65,840.80x = 2,800,496,204.52
  5. Step 5: Solve for x
    x = 2,800,496,204.52/65,840.80
  6. Step 6: Final answer
    x = 42,534.36

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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.