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Finding the Fourth Proportional to 15,187.50, 20,959.56 and 8,901.90

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Solution

The fourth proportional to 15,187.50, 20,959.56 and 8,901.90 is: 12,285.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,187.50 : 20,959.56 = 8,901.90 : x
  2. Step 2: Convert to fraction form
    15,187.50/20,959.56 = 8,901.90/x
  3. Step 3: Cross multiply
    15,187.50x = 20,959.56 × 8,901.90
  4. Step 4: Simplify right side
    15,187.50x = 186,579,907.16
  5. Step 5: Solve for x
    x = 186,579,907.16/15,187.50
  6. Step 6: Final answer
    x = 12,285.10

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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.