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Finding the Fourth Proportional to 8,690.95, 13,013.08 and 7,149.57

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Solution

The fourth proportional to 8,690.95, 13,013.08 and 7,149.57 is: 10,705.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.95 : 13,013.08 = 7,149.57 : x
  2. Step 2: Convert to fraction form
    8,690.95/13,013.08 = 7,149.57/x
  3. Step 3: Cross multiply
    8,690.95x = 13,013.08 × 7,149.57
  4. Step 4: Simplify right side
    8,690.95x = 93,037,877.78
  5. Step 5: Solve for x
    x = 93,037,877.78/8,690.95
  6. Step 6: Final answer
    x = 10,705.14

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1.5x scale

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.