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Finding the Fourth Proportional to 30,247.60, 45,378.60 and 12,708.40

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Solution

The fourth proportional to 30,247.60, 45,378.60 and 12,708.40 is: 19,065.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,247.60 : 45,378.60 = 12,708.40 : x
  2. Step 2: Convert to fraction form
    30,247.60/45,378.60 = 12,708.40/x
  3. Step 3: Cross multiply
    30,247.60x = 45,378.60 × 12,708.40
  4. Step 4: Simplify right side
    30,247.60x = 576,689,400.24
  5. Step 5: Solve for x
    x = 576,689,400.24/30,247.60
  6. Step 6: Final answer
    x = 19,065.63

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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.