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Finding the Fourth Proportional to 2,921.78, 4,381.11 and 973.28

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Solution

The fourth proportional to 2,921.78, 4,381.11 and 973.28 is: 1,459.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,921.78 : 4,381.11 = 973.28 : x
  2. Step 2: Convert to fraction form
    2,921.78/4,381.11 = 973.28/x
  3. Step 3: Cross multiply
    2,921.78x = 4,381.11 × 973.28
  4. Step 4: Simplify right side
    2,921.78x = 4,264,046.74
  5. Step 5: Solve for x
    x = 4,264,046.74/2,921.78
  6. Step 6: Final answer
    x = 1,459.40

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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.