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Finding the Fourth Proportional to 9,781.80, 13,215.15 and 9,781.80

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Solution

The fourth proportional to 9,781.80, 13,215.15 and 9,781.80 is: 13,215.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,781.80 : 13,215.15 = 9,781.80 : x
  2. Step 2: Convert to fraction form
    9,781.80/13,215.15 = 9,781.80/x
  3. Step 3: Cross multiply
    9,781.80x = 13,215.15 × 9,781.80
  4. Step 4: Simplify right side
    9,781.80x = 129,267,954.27
  5. Step 5: Solve for x
    x = 129,267,954.27/9,781.80
  6. Step 6: Final answer
    x = 13,215.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.