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Finding the Fourth Proportional to 15,931.98, 21,987.54 and 8,859.78

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Solution

The fourth proportional to 15,931.98, 21,987.54 and 8,859.78 is: 12,227.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,931.98 : 21,987.54 = 8,859.78 : x
  2. Step 2: Convert to fraction form
    15,931.98/21,987.54 = 8,859.78/x
  3. Step 3: Cross multiply
    15,931.98x = 21,987.54 × 8,859.78
  4. Step 4: Simplify right side
    15,931.98x = 194,804,767.14
  5. Step 5: Solve for x
    x = 194,804,767.14/15,931.98
  6. Step 6: Final answer
    x = 12,227.28

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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.