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Finding the Fourth Proportional to 8,419.60, 12,643.80 and 8,160.40

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Solution

The fourth proportional to 8,419.60, 12,643.80 and 8,160.40 is: 12,254.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,419.60 : 12,643.80 = 8,160.40 : x
  2. Step 2: Convert to fraction form
    8,419.60/12,643.80 = 8,160.40/x
  3. Step 3: Cross multiply
    8,419.60x = 12,643.80 × 8,160.40
  4. Step 4: Simplify right side
    8,419.60x = 103,178,465.52
  5. Step 5: Solve for x
    x = 103,178,465.52/8,419.60
  6. Step 6: Final answer
    x = 12,254.56

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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.