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Finding the Fourth Proportional to 985.24, 1,359.78 and 748.80

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Solution

The fourth proportional to 985.24, 1,359.78 and 748.80 is: 1,033.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.24 : 1,359.78 = 748.80 : x
  2. Step 2: Convert to fraction form
    985.24/1,359.78 = 748.80/x
  3. Step 3: Cross multiply
    985.24x = 1,359.78 × 748.80
  4. Step 4: Simplify right side
    985.24x = 1,018,203.26
  5. Step 5: Solve for x
    x = 1,018,203.26/985.24
  6. Step 6: Final answer
    x = 1,033.46

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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.