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Finding the Fourth Proportional to 890.45, 1,228.82 and 497.48

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Solution

The fourth proportional to 890.45, 1,228.82 and 497.48 is: 686.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.45 : 1,228.82 = 497.48 : x
  2. Step 2: Convert to fraction form
    890.45/1,228.82 = 497.48/x
  3. Step 3: Cross multiply
    890.45x = 1,228.82 × 497.48
  4. Step 4: Simplify right side
    890.45x = 611,308.47
  5. Step 5: Solve for x
    x = 611,308.47/890.45
  6. Step 6: Final answer
    x = 686.52

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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.