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Finding the Fourth Proportional to 964.65, 1,331.15 and 571.60

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Solution

The fourth proportional to 964.65, 1,331.15 and 571.60 is: 788.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.65 : 1,331.15 = 571.60 : x
  2. Step 2: Convert to fraction form
    964.65/1,331.15 = 571.60/x
  3. Step 3: Cross multiply
    964.65x = 1,331.15 × 571.60
  4. Step 4: Simplify right side
    964.65x = 760,883.44
  5. Step 5: Solve for x
    x = 760,883.44/964.65
  6. Step 6: Final answer
    x = 788.77

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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.