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Finding the Fourth Proportional to 12,721.54, 17,555.72 and 7,132.54

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Solution

The fourth proportional to 12,721.54, 17,555.72 and 7,132.54 is: 9,842.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,721.54 : 17,555.72 = 7,132.54 : x
  2. Step 2: Convert to fraction form
    12,721.54/17,555.72 = 7,132.54/x
  3. Step 3: Cross multiply
    12,721.54x = 17,555.72 × 7,132.54
  4. Step 4: Simplify right side
    12,721.54x = 125,216,875.13
  5. Step 5: Solve for x
    x = 125,216,875.13/12,721.54
  6. Step 6: Final answer
    x = 9,842.90

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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.