Home / 5,211.72-7,817.55-1,315.80

Finding the Fourth Proportional to 5,211.72, 7,817.55 and 1,315.80

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Solution

The fourth proportional to 5,211.72, 7,817.55 and 1,315.80 is: 1,973.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,211.72 : 7,817.55 = 1,315.80 : x
  2. Step 2: Convert to fraction form
    5,211.72/7,817.55 = 1,315.80/x
  3. Step 3: Cross multiply
    5,211.72x = 7,817.55 × 1,315.80
  4. Step 4: Simplify right side
    5,211.72x = 10,286,332.29
  5. Step 5: Solve for x
    x = 10,286,332.29/5,211.72
  6. Step 6: Final answer
    x = 1,973.69

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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.