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Finding the Fourth Proportional to 12,951.20, 19,430.40 and 5,559.20

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Solution

The fourth proportional to 12,951.20, 19,430.40 and 5,559.20 is: 8,340.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,951.20 : 19,430.40 = 5,559.20 : x
  2. Step 2: Convert to fraction form
    12,951.20/19,430.40 = 5,559.20/x
  3. Step 3: Cross multiply
    12,951.20x = 19,430.40 × 5,559.20
  4. Step 4: Simplify right side
    12,951.20x = 108,017,479.68
  5. Step 5: Solve for x
    x = 108,017,479.68/12,951.20
  6. Step 6: Final answer
    x = 8,340.35

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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.