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Finding the Fourth Proportional to 972.86, 1,342.54 and 553.21

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Solution

The fourth proportional to 972.86, 1,342.54 and 553.21 is: 763.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.86 : 1,342.54 = 553.21 : x
  2. Step 2: Convert to fraction form
    972.86/1,342.54 = 553.21/x
  3. Step 3: Cross multiply
    972.86x = 1,342.54 × 553.21
  4. Step 4: Simplify right side
    972.86x = 742,704.58
  5. Step 5: Solve for x
    x = 742,704.58/972.86
  6. Step 6: Final answer
    x = 763.43

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Double scale
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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.