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Finding the Fourth Proportional to 15,478.84, 21,360.84 and 8,405.20

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Solution

The fourth proportional to 15,478.84, 21,360.84 and 8,405.20 is: 11,599.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,478.84 : 21,360.84 = 8,405.20 : x
  2. Step 2: Convert to fraction form
    15,478.84/21,360.84 = 8,405.20/x
  3. Step 3: Cross multiply
    15,478.84x = 21,360.84 × 8,405.20
  4. Step 4: Simplify right side
    15,478.84x = 179,542,132.37
  5. Step 5: Solve for x
    x = 179,542,132.37/15,478.84
  6. Step 6: Final answer
    x = 11,599.20

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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.