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Finding the Fourth Proportional to 970.12, 1,338.74 and 550.51

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Solution

The fourth proportional to 970.12, 1,338.74 and 550.51 is: 759.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.12 : 1,338.74 = 550.51 : x
  2. Step 2: Convert to fraction form
    970.12/1,338.74 = 550.51/x
  3. Step 3: Cross multiply
    970.12x = 1,338.74 × 550.51
  4. Step 4: Simplify right side
    970.12x = 736,990.74
  5. Step 5: Solve for x
    x = 736,990.74/970.12
  6. Step 6: Final answer
    x = 759.69

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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.