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Finding the Fourth Proportional to 926.89, 1,278.23 and 717.53

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Solution

The fourth proportional to 926.89, 1,278.23 and 717.53 is: 989.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.89 : 1,278.23 = 717.53 : x
  2. Step 2: Convert to fraction form
    926.89/1,278.23 = 717.53/x
  3. Step 3: Cross multiply
    926.89x = 1,278.23 × 717.53
  4. Step 4: Simplify right side
    926.89x = 917,162.43
  5. Step 5: Solve for x
    x = 917,162.43/926.89
  6. Step 6: Final answer
    x = 989.50

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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.