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Finding the Fourth Proportional to 15,369, 21,210.66 and 8,745

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Solution

The fourth proportional to 15,369, 21,210.66 and 8,745 is: 12,068.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,369 : 21,210.66 = 8,745 : x
  2. Step 2: Convert to fraction form
    15,369/21,210.66 = 8,745/x
  3. Step 3: Cross multiply
    15,369x = 21,210.66 × 8,745
  4. Step 4: Simplify right side
    15,369x = 185,487,221.70
  5. Step 5: Solve for x
    x = 185,487,221.70/15,369
  6. Step 6: Final answer
    x = 12,068.92

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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.