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Finding the Fourth Proportional to 14,456.80, 21,672.40 and 8,607.20

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Solution

The fourth proportional to 14,456.80, 21,672.40 and 8,607.20 is: 12,903.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,456.80 : 21,672.40 = 8,607.20 : x
  2. Step 2: Convert to fraction form
    14,456.80/21,672.40 = 8,607.20/x
  3. Step 3: Cross multiply
    14,456.80x = 21,672.40 × 8,607.20
  4. Step 4: Simplify right side
    14,456.80x = 186,538,681.28
  5. Step 5: Solve for x
    x = 186,538,681.28/14,456.80
  6. Step 6: Final answer
    x = 12,903.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.