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Finding the Fourth Proportional to 15,479.78, 21,362.18 and 8,406.20

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Solution

The fourth proportional to 15,479.78, 21,362.18 and 8,406.20 is: 11,600.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.78 : 21,362.18 = 8,406.20 : x
  2. Step 2: Convert to fraction form
    15,479.78/21,362.18 = 8,406.20/x
  3. Step 3: Cross multiply
    15,479.78x = 21,362.18 × 8,406.20
  4. Step 4: Simplify right side
    15,479.78x = 179,574,608.67
  5. Step 5: Solve for x
    x = 179,574,608.67/15,479.78
  6. Step 6: Final answer
    x = 11,600.60

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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.