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Finding the Fourth Proportional to 772.24, 1,064.70 and 660.18

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Solution

The fourth proportional to 772.24, 1,064.70 and 660.18 is: 910.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.24 : 1,064.70 = 660.18 : x
  2. Step 2: Convert to fraction form
    772.24/1,064.70 = 660.18/x
  3. Step 3: Cross multiply
    772.24x = 1,064.70 × 660.18
  4. Step 4: Simplify right side
    772.24x = 702,893.65
  5. Step 5: Solve for x
    x = 702,893.65/772.24
  6. Step 6: Final answer
    x = 910.20

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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.