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Finding the Fourth Proportional to 15,661.16, 21,613.28 and 9,291.53

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Solution

The fourth proportional to 15,661.16, 21,613.28 and 9,291.53 is: 12,822.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,661.16 : 21,613.28 = 9,291.53 : x
  2. Step 2: Convert to fraction form
    15,661.16/21,613.28 = 9,291.53/x
  3. Step 3: Cross multiply
    15,661.16x = 21,613.28 × 9,291.53
  4. Step 4: Simplify right side
    15,661.16x = 200,820,284.99
  5. Step 5: Solve for x
    x = 200,820,284.99/15,661.16
  6. Step 6: Final answer
    x = 12,822.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.