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Finding the Fourth Proportional to 842.55, 1,161.45 and 655.71

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Solution

The fourth proportional to 842.55, 1,161.45 and 655.71 is: 903.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.55 : 1,161.45 = 655.71 : x
  2. Step 2: Convert to fraction form
    842.55/1,161.45 = 655.71/x
  3. Step 3: Cross multiply
    842.55x = 1,161.45 × 655.71
  4. Step 4: Simplify right side
    842.55x = 761,574.38
  5. Step 5: Solve for x
    x = 761,574.38/842.55
  6. Step 6: Final answer
    x = 903.89

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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.