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Finding the Fourth Proportional to 890.93, 1,229.45 and 492.59

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Solution

The fourth proportional to 890.93, 1,229.45 and 492.59 is: 679.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.93 : 1,229.45 = 492.59 : x
  2. Step 2: Convert to fraction form
    890.93/1,229.45 = 492.59/x
  3. Step 3: Cross multiply
    890.93x = 1,229.45 × 492.59
  4. Step 4: Simplify right side
    890.93x = 605,615.39
  5. Step 5: Solve for x
    x = 605,615.39/890.93
  6. Step 6: Final answer
    x = 679.75

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1.5x scale

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.