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Finding the Fourth Proportional to 8,759.90, 13,139.93 and 2,916.50

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Solution

The fourth proportional to 8,759.90, 13,139.93 and 2,916.50 is: 4,374.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,759.90 : 13,139.93 = 2,916.50 : x
  2. Step 2: Convert to fraction form
    8,759.90/13,139.93 = 2,916.50/x
  3. Step 3: Cross multiply
    8,759.90x = 13,139.93 × 2,916.50
  4. Step 4: Simplify right side
    8,759.90x = 38,322,547.44
  5. Step 5: Solve for x
    x = 38,322,547.44/8,759.90
  6. Step 6: Final answer
    x = 4,374.77

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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.