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Finding the Fourth Proportional to 970.14, 1,339.02 and 691.91

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Solution

The fourth proportional to 970.14, 1,339.02 and 691.91 is: 954.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.14 : 1,339.02 = 691.91 : x
  2. Step 2: Convert to fraction form
    970.14/1,339.02 = 691.91/x
  3. Step 3: Cross multiply
    970.14x = 1,339.02 × 691.91
  4. Step 4: Simplify right side
    970.14x = 926,474.63
  5. Step 5: Solve for x
    x = 926,474.63/970.14
  6. Step 6: Final answer
    x = 954.99

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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.