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Finding the Fourth Proportional to 956.56, 1,320.03 and 558.31

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Solution

The fourth proportional to 956.56, 1,320.03 and 558.31 is: 770.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.56 : 1,320.03 = 558.31 : x
  2. Step 2: Convert to fraction form
    956.56/1,320.03 = 558.31/x
  3. Step 3: Cross multiply
    956.56x = 1,320.03 × 558.31
  4. Step 4: Simplify right side
    956.56x = 736,985.95
  5. Step 5: Solve for x
    x = 736,985.95/956.56
  6. Step 6: Final answer
    x = 770.45

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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.