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Finding the Fourth Proportional to 891.75, 1,230.62 and 498.77

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Solution

The fourth proportional to 891.75, 1,230.62 and 498.77 is: 688.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.75 : 1,230.62 = 498.77 : x
  2. Step 2: Convert to fraction form
    891.75/1,230.62 = 498.77/x
  3. Step 3: Cross multiply
    891.75x = 1,230.62 × 498.77
  4. Step 4: Simplify right side
    891.75x = 613,796.92
  5. Step 5: Solve for x
    x = 613,796.92/891.75
  6. Step 6: Final answer
    x = 688.31

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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.