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Finding the Fourth Proportional to 891.15, 1,230.55 and 669.72

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Solution

The fourth proportional to 891.15, 1,230.55 and 669.72 is: 924.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.15 : 1,230.55 = 669.72 : x
  2. Step 2: Convert to fraction form
    891.15/1,230.55 = 669.72/x
  3. Step 3: Cross multiply
    891.15x = 1,230.55 × 669.72
  4. Step 4: Simplify right side
    891.15x = 824,122.27
  5. Step 5: Solve for x
    x = 824,122.27/891.15
  6. Step 6: Final answer
    x = 924.78

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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.