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Finding the Fourth Proportional to 15,871.87, 21,903.38 and 9,158.89

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Solution

The fourth proportional to 15,871.87, 21,903.38 and 9,158.89 is: 12,639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.87 : 21,903.38 = 9,158.89 : x
  2. Step 2: Convert to fraction form
    15,871.87/21,903.38 = 9,158.89/x
  3. Step 3: Cross multiply
    15,871.87x = 21,903.38 × 9,158.89
  4. Step 4: Simplify right side
    15,871.87x = 200,610,648.05
  5. Step 5: Solve for x
    x = 200,610,648.05/15,871.87
  6. Step 6: Final answer
    x = 12,639.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.