Home / 5,120.15-7,680.23-1,657.40

Finding the Fourth Proportional to 5,120.15, 7,680.23 and 1,657.40

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Solution

The fourth proportional to 5,120.15, 7,680.23 and 1,657.40 is: 2,486.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.15 : 7,680.23 = 1,657.40 : x
  2. Step 2: Convert to fraction form
    5,120.15/7,680.23 = 1,657.40/x
  3. Step 3: Cross multiply
    5,120.15x = 7,680.23 × 1,657.40
  4. Step 4: Simplify right side
    5,120.15x = 12,729,204.92
  5. Step 5: Solve for x
    x = 12,729,204.92/5,120.15
  6. Step 6: Final answer
    x = 2,486.10

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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.