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Finding the Fourth Proportional to 15,854.78, 21,879.78 and 8,781.32

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Solution

The fourth proportional to 15,854.78, 21,879.78 and 8,781.32 is: 12,118.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,854.78 : 21,879.78 = 8,781.32 : x
  2. Step 2: Convert to fraction form
    15,854.78/21,879.78 = 8,781.32/x
  3. Step 3: Cross multiply
    15,854.78x = 21,879.78 × 8,781.32
  4. Step 4: Simplify right side
    15,854.78x = 192,133,349.71
  5. Step 5: Solve for x
    x = 192,133,349.71/15,854.78
  6. Step 6: Final answer
    x = 12,118.32

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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.