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Finding the Fourth Proportional to 15,354.87, 21,189.60 and 8,730.87

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Solution

The fourth proportional to 15,354.87, 21,189.60 and 8,730.87 is: 12,048.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,354.87 : 21,189.60 = 8,730.87 : x
  2. Step 2: Convert to fraction form
    15,354.87/21,189.60 = 8,730.87/x
  3. Step 3: Cross multiply
    15,354.87x = 21,189.60 × 8,730.87
  4. Step 4: Simplify right side
    15,354.87x = 185,003,642.95
  5. Step 5: Solve for x
    x = 185,003,642.95/15,354.87
  6. Step 6: Final answer
    x = 12,048.53

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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.