Home / 1,278.59-1,917.90-457.45

Finding the Fourth Proportional to 1,278.59, 1,917.90 and 457.45

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Solution

The fourth proportional to 1,278.59, 1,917.90 and 457.45 is: 686.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.59 : 1,917.90 = 457.45 : x
  2. Step 2: Convert to fraction form
    1,278.59/1,917.90 = 457.45/x
  3. Step 3: Cross multiply
    1,278.59x = 1,917.90 × 457.45
  4. Step 4: Simplify right side
    1,278.59x = 877,338.56
  5. Step 5: Solve for x
    x = 877,338.56/1,278.59
  6. Step 6: Final answer
    x = 686.18

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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.