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Finding the Fourth Proportional to 970.62, 1,332.95 and 830.75

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Solution

The fourth proportional to 970.62, 1,332.95 and 830.75 is: 1,140.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.62 : 1,332.95 = 830.75 : x
  2. Step 2: Convert to fraction form
    970.62/1,332.95 = 830.75/x
  3. Step 3: Cross multiply
    970.62x = 1,332.95 × 830.75
  4. Step 4: Simplify right side
    970.62x = 1,107,337.39
  5. Step 5: Solve for x
    x = 1,107,337.39/970.62
  6. Step 6: Final answer
    x = 1,140.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.