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Finding the Fourth Proportional to 15,355.92, 21,192.88 and 8,641.76

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Solution

The fourth proportional to 15,355.92, 21,192.88 and 8,641.76 is: 11,926.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,355.92 : 21,192.88 = 8,641.76 : x
  2. Step 2: Convert to fraction form
    15,355.92/21,192.88 = 8,641.76/x
  3. Step 3: Cross multiply
    15,355.92x = 21,192.88 × 8,641.76
  4. Step 4: Simplify right side
    15,355.92x = 183,143,782.67
  5. Step 5: Solve for x
    x = 183,143,782.67/15,355.92
  6. Step 6: Final answer
    x = 11,926.59

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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.