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Finding the Fourth Proportional to 788.25, 1,087.67 and 456.61

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Solution

The fourth proportional to 788.25, 1,087.67 and 456.61 is: 630.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.25 : 1,087.67 = 456.61 : x
  2. Step 2: Convert to fraction form
    788.25/1,087.67 = 456.61/x
  3. Step 3: Cross multiply
    788.25x = 1,087.67 × 456.61
  4. Step 4: Simplify right side
    788.25x = 496,641.31
  5. Step 5: Solve for x
    x = 496,641.31/788.25
  6. Step 6: Final answer
    x = 630.06

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1.5x scale

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.