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Finding the Fourth Proportional to 65,668.48, 98,488.32 and 18,911.20

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Solution

The fourth proportional to 65,668.48, 98,488.32 and 18,911.20 is: 28,362.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,668.48 : 98,488.32 = 18,911.20 : x
  2. Step 2: Convert to fraction form
    65,668.48/98,488.32 = 18,911.20/x
  3. Step 3: Cross multiply
    65,668.48x = 98,488.32 × 18,911.20
  4. Step 4: Simplify right side
    65,668.48x = 1,862,532,317.18
  5. Step 5: Solve for x
    x = 1,862,532,317.18/65,668.48
  6. Step 6: Final answer
    x = 28,362.65

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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.