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Finding the Fourth Proportional to 8,689.60, 13,034.40 and 5,190.40

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Solution

The fourth proportional to 8,689.60, 13,034.40 and 5,190.40 is: 7,785.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.60 : 13,034.40 = 5,190.40 : x
  2. Step 2: Convert to fraction form
    8,689.60/13,034.40 = 5,190.40/x
  3. Step 3: Cross multiply
    8,689.60x = 13,034.40 × 5,190.40
  4. Step 4: Simplify right side
    8,689.60x = 67,653,749.76
  5. Step 5: Solve for x
    x = 67,653,749.76/8,689.60
  6. Step 6: Final answer
    x = 7,785.60

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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.