Home / 12,780.56-17,638.90-9,631.28

Finding the Fourth Proportional to 12,780.56, 17,638.90 and 9,631.28

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Solution

The fourth proportional to 12,780.56, 17,638.90 and 9,631.28 is: 13,292.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.56 : 17,638.90 = 9,631.28 : x
  2. Step 2: Convert to fraction form
    12,780.56/17,638.90 = 9,631.28/x
  3. Step 3: Cross multiply
    12,780.56x = 17,638.90 × 9,631.28
  4. Step 4: Simplify right side
    12,780.56x = 169,885,184.79
  5. Step 5: Solve for x
    x = 169,885,184.79/12,780.56
  6. Step 6: Final answer
    x = 13,292.47

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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.