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Finding the Fourth Proportional to 788.13, 1,087.67 and 456.66

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Solution

The fourth proportional to 788.13, 1,087.67 and 456.66 is: 630.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.13 : 1,087.67 = 456.66 : x
  2. Step 2: Convert to fraction form
    788.13/1,087.67 = 456.66/x
  3. Step 3: Cross multiply
    788.13x = 1,087.67 × 456.66
  4. Step 4: Simplify right side
    788.13x = 496,693.10
  5. Step 5: Solve for x
    x = 496,693.10/788.13
  6. Step 6: Final answer
    x = 630.22

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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.