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Finding the Fourth Proportional to 2,916.50, 4,374.75 and 864.50

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Solution

The fourth proportional to 2,916.50, 4,374.75 and 864.50 is: 1,296.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,916.50 : 4,374.75 = 864.50 : x
  2. Step 2: Convert to fraction form
    2,916.50/4,374.75 = 864.50/x
  3. Step 3: Cross multiply
    2,916.50x = 4,374.75 × 864.50
  4. Step 4: Simplify right side
    2,916.50x = 3,781,971.38
  5. Step 5: Solve for x
    x = 3,781,971.38/2,916.50
  6. Step 6: Final answer
    x = 1,296.75

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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.