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Finding the Fourth Proportional to 19,681.20, 29,521.80 and 9,151.20

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Solution

The fourth proportional to 19,681.20, 29,521.80 and 9,151.20 is: 13,726.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,681.20 : 29,521.80 = 9,151.20 : x
  2. Step 2: Convert to fraction form
    19,681.20/29,521.80 = 9,151.20/x
  3. Step 3: Cross multiply
    19,681.20x = 29,521.80 × 9,151.20
  4. Step 4: Simplify right side
    19,681.20x = 270,159,896.16
  5. Step 5: Solve for x
    x = 270,159,896.16/19,681.20
  6. Step 6: Final answer
    x = 13,726.80

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1.5x scale

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.