Home / 1,240.24-1,860.36-315.80

Finding the Fourth Proportional to 1,240.24, 1,860.36 and 315.80

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Solution

The fourth proportional to 1,240.24, 1,860.36 and 315.80 is: 473.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.24 : 1,860.36 = 315.80 : x
  2. Step 2: Convert to fraction form
    1,240.24/1,860.36 = 315.80/x
  3. Step 3: Cross multiply
    1,240.24x = 1,860.36 × 315.80
  4. Step 4: Simplify right side
    1,240.24x = 587,500.11
  5. Step 5: Solve for x
    x = 587,500.11/1,240.24
  6. Step 6: Final answer
    x = 473.70

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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.