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Finding the Fourth Proportional to 15,564.55, 21,479.12 and 8,491.12

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Solution

The fourth proportional to 15,564.55, 21,479.12 and 8,491.12 is: 11,717.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,564.55 : 21,479.12 = 8,491.12 : x
  2. Step 2: Convert to fraction form
    15,564.55/21,479.12 = 8,491.12/x
  3. Step 3: Cross multiply
    15,564.55x = 21,479.12 × 8,491.12
  4. Step 4: Simplify right side
    15,564.55x = 182,381,699.25
  5. Step 5: Solve for x
    x = 182,381,699.25/15,564.55
  6. Step 6: Final answer
    x = 11,717.77

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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.