Home / 1,117.12-1,541.60-619.78

Finding the Fourth Proportional to 1,117.12, 1,541.60 and 619.78

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Solution

The fourth proportional to 1,117.12, 1,541.60 and 619.78 is: 855.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.12 : 1,541.60 = 619.78 : x
  2. Step 2: Convert to fraction form
    1,117.12/1,541.60 = 619.78/x
  3. Step 3: Cross multiply
    1,117.12x = 1,541.60 × 619.78
  4. Step 4: Simplify right side
    1,117.12x = 955,452.85
  5. Step 5: Solve for x
    x = 955,452.85/1,117.12
  6. Step 6: Final answer
    x = 855.28

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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.