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Finding the Fourth Proportional to 970.62, 1,339.92 and 691.44

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Solution

The fourth proportional to 970.62, 1,339.92 and 691.44 is: 954.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.62 : 1,339.92 = 691.44 : x
  2. Step 2: Convert to fraction form
    970.62/1,339.92 = 691.44/x
  3. Step 3: Cross multiply
    970.62x = 1,339.92 × 691.44
  4. Step 4: Simplify right side
    970.62x = 926,474.28
  5. Step 5: Solve for x
    x = 926,474.28/970.62
  6. Step 6: Final answer
    x = 954.52

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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.