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Finding the Fourth Proportional to 891.90, 1,230.74 and 498.91

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Solution

The fourth proportional to 891.90, 1,230.74 and 498.91 is: 688.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.90 : 1,230.74 = 498.91 : x
  2. Step 2: Convert to fraction form
    891.90/1,230.74 = 498.91/x
  3. Step 3: Cross multiply
    891.90x = 1,230.74 × 498.91
  4. Step 4: Simplify right side
    891.90x = 614,028.49
  5. Step 5: Solve for x
    x = 614,028.49/891.90
  6. Step 6: Final answer
    x = 688.45

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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.