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Finding the Fourth Proportional to 970.13, 1,338.77 and 550.49

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Solution

The fourth proportional to 970.13, 1,338.77 and 550.49 is: 759.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.13 : 1,338.77 = 550.49 : x
  2. Step 2: Convert to fraction form
    970.13/1,338.77 = 550.49/x
  3. Step 3: Cross multiply
    970.13x = 1,338.77 × 550.49
  4. Step 4: Simplify right side
    970.13x = 736,974.18
  5. Step 5: Solve for x
    x = 736,974.18/970.13
  6. Step 6: Final answer
    x = 759.66

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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.