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Finding the Fourth Proportional to 740.63, 1,020.78 and 681.77

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Solution

The fourth proportional to 740.63, 1,020.78 and 681.77 is: 939.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.63 : 1,020.78 = 681.77 : x
  2. Step 2: Convert to fraction form
    740.63/1,020.78 = 681.77/x
  3. Step 3: Cross multiply
    740.63x = 1,020.78 × 681.77
  4. Step 4: Simplify right side
    740.63x = 695,932.08
  5. Step 5: Solve for x
    x = 695,932.08/740.63
  6. Step 6: Final answer
    x = 939.66

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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.