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Finding the Fourth Proportional to 15,369.95, 21,202.88 and 9,391.20

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Solution

The fourth proportional to 15,369.95, 21,202.88 and 9,391.20 is: 12,955.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,369.95 : 21,202.88 = 9,391.20 : x
  2. Step 2: Convert to fraction form
    15,369.95/21,202.88 = 9,391.20/x
  3. Step 3: Cross multiply
    15,369.95x = 21,202.88 × 9,391.20
  4. Step 4: Simplify right side
    15,369.95x = 199,120,439.70
  5. Step 5: Solve for x
    x = 199,120,439.70/15,369.95
  6. Step 6: Final answer
    x = 12,955.18

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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.