Home / 1,611.29-2,415.95-686.33

Finding the Fourth Proportional to 1,611.29, 2,415.95 and 686.33

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Solution

The fourth proportional to 1,611.29, 2,415.95 and 686.33 is: 1,029.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.29 : 2,415.95 = 686.33 : x
  2. Step 2: Convert to fraction form
    1,611.29/2,415.95 = 686.33/x
  3. Step 3: Cross multiply
    1,611.29x = 2,415.95 × 686.33
  4. Step 4: Simplify right side
    1,611.29x = 1,658,123.45
  5. Step 5: Solve for x
    x = 1,658,123.45/1,611.29
  6. Step 6: Final answer
    x = 1,029.07

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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.