Home / 1,278.65-1,917.49-456.77

Finding the Fourth Proportional to 1,278.65, 1,917.49 and 456.77

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Solution

The fourth proportional to 1,278.65, 1,917.49 and 456.77 is: 684.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.65 : 1,917.49 = 456.77 : x
  2. Step 2: Convert to fraction form
    1,278.65/1,917.49 = 456.77/x
  3. Step 3: Cross multiply
    1,278.65x = 1,917.49 × 456.77
  4. Step 4: Simplify right side
    1,278.65x = 875,851.91
  5. Step 5: Solve for x
    x = 875,851.91/1,278.65
  6. Step 6: Final answer
    x = 684.98

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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.