Home / 15,631.78-21,574.36-8,919.59

Finding the Fourth Proportional to 15,631.78, 21,574.36 and 8,919.59

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Solution

The fourth proportional to 15,631.78, 21,574.36 and 8,919.59 is: 12,310.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,631.78 : 21,574.36 = 8,919.59 : x
  2. Step 2: Convert to fraction form
    15,631.78/21,574.36 = 8,919.59/x
  3. Step 3: Cross multiply
    15,631.78x = 21,574.36 × 8,919.59
  4. Step 4: Simplify right side
    15,631.78x = 192,434,445.71
  5. Step 5: Solve for x
    x = 192,434,445.71/15,631.78
  6. Step 6: Final answer
    x = 12,310.46

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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.