Home / 1,278.50-1,916.61-456.66

Finding the Fourth Proportional to 1,278.50, 1,916.61 and 456.66

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Solution

The fourth proportional to 1,278.50, 1,916.61 and 456.66 is: 684.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.50 : 1,916.61 = 456.66 : x
  2. Step 2: Convert to fraction form
    1,278.50/1,916.61 = 456.66/x
  3. Step 3: Cross multiply
    1,278.50x = 1,916.61 × 456.66
  4. Step 4: Simplify right side
    1,278.50x = 875,227.26
  5. Step 5: Solve for x
    x = 875,227.26/1,278.50
  6. Step 6: Final answer
    x = 684.57

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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.