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Finding the Fourth Proportional to 788.40, 1,087.85 and 456.71

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Solution

The fourth proportional to 788.40, 1,087.85 and 456.71 is: 630.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.40 : 1,087.85 = 456.71 : x
  2. Step 2: Convert to fraction form
    788.40/1,087.85 = 456.71/x
  3. Step 3: Cross multiply
    788.40x = 1,087.85 × 456.71
  4. Step 4: Simplify right side
    788.40x = 496,827.68
  5. Step 5: Solve for x
    x = 496,827.68/788.40
  6. Step 6: Final answer
    x = 630.17

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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.