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Finding the Fourth Proportional to 972.90, 1,342.74 and 553.38

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Solution

The fourth proportional to 972.90, 1,342.74 and 553.38 is: 763.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.90 : 1,342.74 = 553.38 : x
  2. Step 2: Convert to fraction form
    972.90/1,342.74 = 553.38/x
  3. Step 3: Cross multiply
    972.90x = 1,342.74 × 553.38
  4. Step 4: Simplify right side
    972.90x = 743,045.46
  5. Step 5: Solve for x
    x = 743,045.46/972.90
  6. Step 6: Final answer
    x = 763.74

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Double scale
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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.