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Finding the Fourth Proportional to 890.29, 1,228.59 and 497.32

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Solution

The fourth proportional to 890.29, 1,228.59 and 497.32 is: 686.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.29 : 1,228.59 = 497.32 : x
  2. Step 2: Convert to fraction form
    890.29/1,228.59 = 497.32/x
  3. Step 3: Cross multiply
    890.29x = 1,228.59 × 497.32
  4. Step 4: Simplify right side
    890.29x = 611,002.38
  5. Step 5: Solve for x
    x = 611,002.38/890.29
  6. Step 6: Final answer
    x = 686.30

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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.