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Finding the Fourth Proportional to 14,159.80, 21,247.80 and 9,780.40

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Solution

The fourth proportional to 14,159.80, 21,247.80 and 9,780.40 is: 14,676.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,159.80 : 21,247.80 = 9,780.40 : x
  2. Step 2: Convert to fraction form
    14,159.80/21,247.80 = 9,780.40/x
  3. Step 3: Cross multiply
    14,159.80x = 21,247.80 × 9,780.40
  4. Step 4: Simplify right side
    14,159.80x = 207,811,983.12
  5. Step 5: Solve for x
    x = 207,811,983.12/14,159.80
  6. Step 6: Final answer
    x = 14,676.19

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1.5x scale

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.