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Finding the Fourth Proportional to 788.67, 1,085.67 and 677.50

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Solution

The fourth proportional to 788.67, 1,085.67 and 677.50 is: 932.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.67 : 1,085.67 = 677.50 : x
  2. Step 2: Convert to fraction form
    788.67/1,085.67 = 677.50/x
  3. Step 3: Cross multiply
    788.67x = 1,085.67 × 677.50
  4. Step 4: Simplify right side
    788.67x = 735,538.71
  5. Step 5: Solve for x
    x = 735,538.71/788.67
  6. Step 6: Final answer
    x = 932.63

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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.