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Finding the Fourth Proportional to 708.28, 1,061.80 and 275.13

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Solution

The fourth proportional to 708.28, 1,061.80 and 275.13 is: 412.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.28 : 1,061.80 = 275.13 : x
  2. Step 2: Convert to fraction form
    708.28/1,061.80 = 275.13/x
  3. Step 3: Cross multiply
    708.28x = 1,061.80 × 275.13
  4. Step 4: Simplify right side
    708.28x = 292,133.03
  5. Step 5: Solve for x
    x = 292,133.03/708.28
  6. Step 6: Final answer
    x = 412.45

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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.