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Finding the Fourth Proportional to 8,419.20, 12,643.20 and 5,510.40

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Solution

The fourth proportional to 8,419.20, 12,643.20 and 5,510.40 is: 8,275.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,419.20 : 12,643.20 = 5,510.40 : x
  2. Step 2: Convert to fraction form
    8,419.20/12,643.20 = 5,510.40/x
  3. Step 3: Cross multiply
    8,419.20x = 12,643.20 × 5,510.40
  4. Step 4: Simplify right side
    8,419.20x = 69,669,089.28
  5. Step 5: Solve for x
    x = 69,669,089.28/8,419.20
  6. Step 6: Final answer
    x = 8,275.02

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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.