Home / 1,543.78-2,131.32-1,020.70

Finding the Fourth Proportional to 1,543.78, 2,131.32 and 1,020.70

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Solution

The fourth proportional to 1,543.78, 2,131.32 and 1,020.70 is: 1,409.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.78 : 2,131.32 = 1,020.70 : x
  2. Step 2: Convert to fraction form
    1,543.78/2,131.32 = 1,020.70/x
  3. Step 3: Cross multiply
    1,543.78x = 2,131.32 × 1,020.70
  4. Step 4: Simplify right side
    1,543.78x = 2,175,438.32
  5. Step 5: Solve for x
    x = 2,175,438.32/1,543.78
  6. Step 6: Final answer
    x = 1,409.16

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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.