Home / 5,178.40-7,767.60-1,715.20

Finding the Fourth Proportional to 5,178.40, 7,767.60 and 1,715.20

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Solution

The fourth proportional to 5,178.40, 7,767.60 and 1,715.20 is: 2,572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.40 : 7,767.60 = 1,715.20 : x
  2. Step 2: Convert to fraction form
    5,178.40/7,767.60 = 1,715.20/x
  3. Step 3: Cross multiply
    5,178.40x = 7,767.60 × 1,715.20
  4. Step 4: Simplify right side
    5,178.40x = 13,322,987.52
  5. Step 5: Solve for x
    x = 13,322,987.52/5,178.40
  6. Step 6: Final answer
    x = 2,572.80

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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.