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Finding the Fourth Proportional to 890.39, 1,228.62 and 497.43

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Solution

The fourth proportional to 890.39, 1,228.62 and 497.43 is: 686.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.39 : 1,228.62 = 497.43 : x
  2. Step 2: Convert to fraction form
    890.39/1,228.62 = 497.43/x
  3. Step 3: Cross multiply
    890.39x = 1,228.62 × 497.43
  4. Step 4: Simplify right side
    890.39x = 611,152.45
  5. Step 5: Solve for x
    x = 611,152.45/890.39
  6. Step 6: Final answer
    x = 686.39

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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.