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Finding the Fourth Proportional to 12,489.61, 18,643.29 and 10,913.17

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Solution

The fourth proportional to 12,489.61, 18,643.29 and 10,913.17 is: 16,290.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.61 : 18,643.29 = 10,913.17 : x
  2. Step 2: Convert to fraction form
    12,489.61/18,643.29 = 10,913.17/x
  3. Step 3: Cross multiply
    12,489.61x = 18,643.29 × 10,913.17
  4. Step 4: Simplify right side
    12,489.61x = 203,457,345.03
  5. Step 5: Solve for x
    x = 203,457,345.03/12,489.61
  6. Step 6: Final answer
    x = 16,290.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.