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Finding the Fourth Proportional to 972.71, 1,342.27 and 553.13

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Solution

The fourth proportional to 972.71, 1,342.27 and 553.13 is: 763.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.71 : 1,342.27 = 553.13 : x
  2. Step 2: Convert to fraction form
    972.71/1,342.27 = 553.13/x
  3. Step 3: Cross multiply
    972.71x = 1,342.27 × 553.13
  4. Step 4: Simplify right side
    972.71x = 742,448.82
  5. Step 5: Solve for x
    x = 742,448.82/972.71
  6. Step 6: Final answer
    x = 763.28

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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.