Home / 1,916.80-2,646.87-1,209.91

Finding the Fourth Proportional to 1,916.80, 2,646.87 and 1,209.91

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Solution

The fourth proportional to 1,916.80, 2,646.87 and 1,209.91 is: 1,670.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.80 : 2,646.87 = 1,209.91 : x
  2. Step 2: Convert to fraction form
    1,916.80/2,646.87 = 1,209.91/x
  3. Step 3: Cross multiply
    1,916.80x = 2,646.87 × 1,209.91
  4. Step 4: Simplify right side
    1,916.80x = 3,202,474.48
  5. Step 5: Solve for x
    x = 3,202,474.48/1,916.80
  6. Step 6: Final answer
    x = 1,670.74

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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.