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Finding the Fourth Proportional to 956.77, 1,320.18 and 642.55

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Solution

The fourth proportional to 956.77, 1,320.18 and 642.55 is: 886.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.77 : 1,320.18 = 642.55 : x
  2. Step 2: Convert to fraction form
    956.77/1,320.18 = 642.55/x
  3. Step 3: Cross multiply
    956.77x = 1,320.18 × 642.55
  4. Step 4: Simplify right side
    956.77x = 848,281.66
  5. Step 5: Solve for x
    x = 848,281.66/956.77
  6. Step 6: Final answer
    x = 886.61

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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.