Home / 1,247.18-1,720.23-1,072.22

Finding the Fourth Proportional to 1,247.18, 1,720.23 and 1,072.22

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Solution

The fourth proportional to 1,247.18, 1,720.23 and 1,072.22 is: 1,478.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.18 : 1,720.23 = 1,072.22 : x
  2. Step 2: Convert to fraction form
    1,247.18/1,720.23 = 1,072.22/x
  3. Step 3: Cross multiply
    1,247.18x = 1,720.23 × 1,072.22
  4. Step 4: Simplify right side
    1,247.18x = 1,844,462.86
  5. Step 5: Solve for x
    x = 1,844,462.86/1,247.18
  6. Step 6: Final answer
    x = 1,478.91

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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.