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Finding the Fourth Proportional to 921.01, 1,381.76 and 459.01

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Solution

The fourth proportional to 921.01, 1,381.76 and 459.01 is: 688.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.01 : 1,381.76 = 459.01 : x
  2. Step 2: Convert to fraction form
    921.01/1,381.76 = 459.01/x
  3. Step 3: Cross multiply
    921.01x = 1,381.76 × 459.01
  4. Step 4: Simplify right side
    921.01x = 634,238.92
  5. Step 5: Solve for x
    x = 634,238.92/921.01
  6. Step 6: Final answer
    x = 688.63

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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.