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Finding the Fourth Proportional to 956.89, 1,320.55 and 578.90

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Solution

The fourth proportional to 956.89, 1,320.55 and 578.90 is: 798.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.89 : 1,320.55 = 578.90 : x
  2. Step 2: Convert to fraction form
    956.89/1,320.55 = 578.90/x
  3. Step 3: Cross multiply
    956.89x = 1,320.55 × 578.90
  4. Step 4: Simplify right side
    956.89x = 764,468.25
  5. Step 5: Solve for x
    x = 764,468.25/956.89
  6. Step 6: Final answer
    x = 798.91

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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.