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Finding the Fourth Proportional to 15,643.52, 21,590.11 and 8,927.61

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Solution

The fourth proportional to 15,643.52, 21,590.11 and 8,927.61 is: 12,321.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,643.52 : 21,590.11 = 8,927.61 : x
  2. Step 2: Convert to fraction form
    15,643.52/21,590.11 = 8,927.61/x
  3. Step 3: Cross multiply
    15,643.52x = 21,590.11 × 8,927.61
  4. Step 4: Simplify right side
    15,643.52x = 192,748,081.94
  5. Step 5: Solve for x
    x = 192,748,081.94/15,643.52
  6. Step 6: Final answer
    x = 12,321.27

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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.