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Finding the Fourth Proportional to 970.12, 1,338.78 and 550.45

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Solution

The fourth proportional to 970.12, 1,338.78 and 550.45 is: 759.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.12 : 1,338.78 = 550.45 : x
  2. Step 2: Convert to fraction form
    970.12/1,338.78 = 550.45/x
  3. Step 3: Cross multiply
    970.12x = 1,338.78 × 550.45
  4. Step 4: Simplify right side
    970.12x = 736,931.45
  5. Step 5: Solve for x
    x = 736,931.45/970.12
  6. Step 6: Final answer
    x = 759.63

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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.