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Finding the Fourth Proportional to 964.09, 1,330.55 and 571.15

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Solution

The fourth proportional to 964.09, 1,330.55 and 571.15 is: 788.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.09 : 1,330.55 = 571.15 : x
  2. Step 2: Convert to fraction form
    964.09/1,330.55 = 571.15/x
  3. Step 3: Cross multiply
    964.09x = 1,330.55 × 571.15
  4. Step 4: Simplify right side
    964.09x = 759,943.63
  5. Step 5: Solve for x
    x = 759,943.63/964.09
  6. Step 6: Final answer
    x = 788.25

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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.