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Finding the Fourth Proportional to 788.17, 1,087.86 and 456.79

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Solution

The fourth proportional to 788.17, 1,087.86 and 456.79 is: 630.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.17 : 1,087.86 = 456.79 : x
  2. Step 2: Convert to fraction form
    788.17/1,087.86 = 456.79/x
  3. Step 3: Cross multiply
    788.17x = 1,087.86 × 456.79
  4. Step 4: Simplify right side
    788.17x = 496,927.08
  5. Step 5: Solve for x
    x = 496,927.08/788.17
  6. Step 6: Final answer
    x = 630.48

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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.