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Finding the Fourth Proportional to 890.13, 1,228.40 and 497.16

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Solution

The fourth proportional to 890.13, 1,228.40 and 497.16 is: 686.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.13 : 1,228.40 = 497.16 : x
  2. Step 2: Convert to fraction form
    890.13/1,228.40 = 497.16/x
  3. Step 3: Cross multiply
    890.13x = 1,228.40 × 497.16
  4. Step 4: Simplify right side
    890.13x = 610,708.86
  5. Step 5: Solve for x
    x = 610,708.86/890.13
  6. Step 6: Final answer
    x = 686.09

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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.