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Finding the Fourth Proportional to 15,927.80, 21,980.16 and 8,854.20

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Solution

The fourth proportional to 15,927.80, 21,980.16 and 8,854.20 is: 12,218.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,927.80 : 21,980.16 = 8,854.20 : x
  2. Step 2: Convert to fraction form
    15,927.80/21,980.16 = 8,854.20/x
  3. Step 3: Cross multiply
    15,927.80x = 21,980.16 × 8,854.20
  4. Step 4: Simplify right side
    15,927.80x = 194,616,732.67
  5. Step 5: Solve for x
    x = 194,616,732.67/15,927.80
  6. Step 6: Final answer
    x = 12,218.68

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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.