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Finding the Fourth Proportional to 2,913, 4,369.47 and 721.72

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Solution

The fourth proportional to 2,913, 4,369.47 and 721.72 is: 1,082.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,913 : 4,369.47 = 721.72 : x
  2. Step 2: Convert to fraction form
    2,913/4,369.47 = 721.72/x
  3. Step 3: Cross multiply
    2,913x = 4,369.47 × 721.72
  4. Step 4: Simplify right side
    2,913x = 3,153,533.89
  5. Step 5: Solve for x
    x = 3,153,533.89/2,913
  6. Step 6: Final answer
    x = 1,082.57

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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.