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Finding the Fourth Proportional to 956.42, 1,320.18 and 620.78

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Solution

The fourth proportional to 956.42, 1,320.18 and 620.78 is: 856.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.42 : 1,320.18 = 620.78 : x
  2. Step 2: Convert to fraction form
    956.42/1,320.18 = 620.78/x
  3. Step 3: Cross multiply
    956.42x = 1,320.18 × 620.78
  4. Step 4: Simplify right side
    956.42x = 819,541.34
  5. Step 5: Solve for x
    x = 819,541.34/956.42
  6. Step 6: Final answer
    x = 856.88

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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.