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Finding the Fourth Proportional to 739.51, 1,020.20 and 542.68

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Solution

The fourth proportional to 739.51, 1,020.20 and 542.68 is: 748.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.51 : 1,020.20 = 542.68 : x
  2. Step 2: Convert to fraction form
    739.51/1,020.20 = 542.68/x
  3. Step 3: Cross multiply
    739.51x = 1,020.20 × 542.68
  4. Step 4: Simplify right side
    739.51x = 553,636.87
  5. Step 5: Solve for x
    x = 553,636.87/739.51
  6. Step 6: Final answer
    x = 748.66

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1.5x scale

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.