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Finding the Fourth Proportional to 891.37, 1,230.12 and 498.47

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Solution

The fourth proportional to 891.37, 1,230.12 and 498.47 is: 687.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.37 : 1,230.12 = 498.47 : x
  2. Step 2: Convert to fraction form
    891.37/1,230.12 = 498.47/x
  3. Step 3: Cross multiply
    891.37x = 1,230.12 × 498.47
  4. Step 4: Simplify right side
    891.37x = 613,177.92
  5. Step 5: Solve for x
    x = 613,177.92/891.37
  6. Step 6: Final answer
    x = 687.91

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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.