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Finding the Fourth Proportional to 15,078.80, 22,612.78 and 5,215.40

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Solution

The fourth proportional to 15,078.80, 22,612.78 and 5,215.40 is: 7,821.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.80 : 22,612.78 = 5,215.40 : x
  2. Step 2: Convert to fraction form
    15,078.80/22,612.78 = 5,215.40/x
  3. Step 3: Cross multiply
    15,078.80x = 22,612.78 × 5,215.40
  4. Step 4: Simplify right side
    15,078.80x = 117,934,692.81
  5. Step 5: Solve for x
    x = 117,934,692.81/15,078.80
  6. Step 6: Final answer
    x = 7,821.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.