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Finding the Fourth Proportional to 788.35, 1,087.90 and 456.77

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Solution

The fourth proportional to 788.35, 1,087.90 and 456.77 is: 630.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.35 : 1,087.90 = 456.77 : x
  2. Step 2: Convert to fraction form
    788.35/1,087.90 = 456.77/x
  3. Step 3: Cross multiply
    788.35x = 1,087.90 × 456.77
  4. Step 4: Simplify right side
    788.35x = 496,920.08
  5. Step 5: Solve for x
    x = 496,920.08/788.35
  6. Step 6: Final answer
    x = 630.33

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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.