Home / 1,278.56-1,917.20-509.04

Finding the Fourth Proportional to 1,278.56, 1,917.20 and 509.04

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Solution

The fourth proportional to 1,278.56, 1,917.20 and 509.04 is: 763.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.56 : 1,917.20 = 509.04 : x
  2. Step 2: Convert to fraction form
    1,278.56/1,917.20 = 509.04/x
  3. Step 3: Cross multiply
    1,278.56x = 1,917.20 × 509.04
  4. Step 4: Simplify right side
    1,278.56x = 975,931.49
  5. Step 5: Solve for x
    x = 975,931.49/1,278.56
  6. Step 6: Final answer
    x = 763.31

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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.