Home / 1,247.55-1,721.43-750.15

Finding the Fourth Proportional to 1,247.55, 1,721.43 and 750.15

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Solution

The fourth proportional to 1,247.55, 1,721.43 and 750.15 is: 1,035.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.55 : 1,721.43 = 750.15 : x
  2. Step 2: Convert to fraction form
    1,247.55/1,721.43 = 750.15/x
  3. Step 3: Cross multiply
    1,247.55x = 1,721.43 × 750.15
  4. Step 4: Simplify right side
    1,247.55x = 1,291,330.71
  5. Step 5: Solve for x
    x = 1,291,330.71/1,247.55
  6. Step 6: Final answer
    x = 1,035.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.