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Finding the Fourth Proportional to 921.89, 1,271.67 and 590.20

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Solution

The fourth proportional to 921.89, 1,271.67 and 590.20 is: 814.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.89 : 1,271.67 = 590.20 : x
  2. Step 2: Convert to fraction form
    921.89/1,271.67 = 590.20/x
  3. Step 3: Cross multiply
    921.89x = 1,271.67 × 590.20
  4. Step 4: Simplify right side
    921.89x = 750,534.24
  5. Step 5: Solve for x
    x = 750,534.24/921.89
  6. Step 6: Final answer
    x = 814.12

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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.