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Finding the Fourth Proportional to 788.31, 1,087.88 and 456.80

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Solution

The fourth proportional to 788.31, 1,087.88 and 456.80 is: 630.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.31 : 1,087.88 = 456.80 : x
  2. Step 2: Convert to fraction form
    788.31/1,087.88 = 456.80/x
  3. Step 3: Cross multiply
    788.31x = 1,087.88 × 456.80
  4. Step 4: Simplify right side
    788.31x = 496,943.58
  5. Step 5: Solve for x
    x = 496,943.58/788.31
  6. Step 6: Final answer
    x = 630.39

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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.