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Finding the Fourth Proportional to 15,148.40, 20,903.40 and 11,171.70

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Solution

The fourth proportional to 15,148.40, 20,903.40 and 11,171.70 is: 15,415.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,148.40 : 20,903.40 = 11,171.70 : x
  2. Step 2: Convert to fraction form
    15,148.40/20,903.40 = 11,171.70/x
  3. Step 3: Cross multiply
    15,148.40x = 20,903.40 × 11,171.70
  4. Step 4: Simplify right side
    15,148.40x = 233,526,513.78
  5. Step 5: Solve for x
    x = 233,526,513.78/15,148.40
  6. Step 6: Final answer
    x = 15,415.92

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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.