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Finding the Fourth Proportional to 963.79, 1,330.20 and 571.01

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Solution

The fourth proportional to 963.79, 1,330.20 and 571.01 is: 788.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.79 : 1,330.20 = 571.01 : x
  2. Step 2: Convert to fraction form
    963.79/1,330.20 = 571.01/x
  3. Step 3: Cross multiply
    963.79x = 1,330.20 × 571.01
  4. Step 4: Simplify right side
    963.79x = 759,550.85
  5. Step 5: Solve for x
    x = 759,550.85/963.79
  6. Step 6: Final answer
    x = 788.09

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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.