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Finding the Fourth Proportional to 890.51, 1,337.38 and 728.51

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Solution

The fourth proportional to 890.51, 1,337.38 and 728.51 is: 1,094.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.51 : 1,337.38 = 728.51 : x
  2. Step 2: Convert to fraction form
    890.51/1,337.38 = 728.51/x
  3. Step 3: Cross multiply
    890.51x = 1,337.38 × 728.51
  4. Step 4: Simplify right side
    890.51x = 974,286.20
  5. Step 5: Solve for x
    x = 974,286.20/890.51
  6. Step 6: Final answer
    x = 1,094.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.