Home / 1,611.30-2,415.15-686.70

Finding the Fourth Proportional to 1,611.30, 2,415.15 and 686.70

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Solution

The fourth proportional to 1,611.30, 2,415.15 and 686.70 is: 1,029.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.30 : 2,415.15 = 686.70 : x
  2. Step 2: Convert to fraction form
    1,611.30/2,415.15 = 686.70/x
  3. Step 3: Cross multiply
    1,611.30x = 2,415.15 × 686.70
  4. Step 4: Simplify right side
    1,611.30x = 1,658,483.51
  5. Step 5: Solve for x
    x = 1,658,483.51/1,611.30
  6. Step 6: Final answer
    x = 1,029.28

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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.