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Finding the Fourth Proportional to 15,105.10, 20,828.78 and 9,437.78

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Solution

The fourth proportional to 15,105.10, 20,828.78 and 9,437.78 is: 13,013.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.10 : 20,828.78 = 9,437.78 : x
  2. Step 2: Convert to fraction form
    15,105.10/20,828.78 = 9,437.78/x
  3. Step 3: Cross multiply
    15,105.10x = 20,828.78 × 9,437.78
  4. Step 4: Simplify right side
    15,105.10x = 196,577,362.76
  5. Step 5: Solve for x
    x = 196,577,362.76/15,105.10
  6. Step 6: Final answer
    x = 13,013.98

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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.