Home / 1,136.20-1,567.80-688.15

Finding the Fourth Proportional to 1,136.20, 1,567.80 and 688.15

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Solution

The fourth proportional to 1,136.20, 1,567.80 and 688.15 is: 949.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.20 : 1,567.80 = 688.15 : x
  2. Step 2: Convert to fraction form
    1,136.20/1,567.80 = 688.15/x
  3. Step 3: Cross multiply
    1,136.20x = 1,567.80 × 688.15
  4. Step 4: Simplify right side
    1,136.20x = 1,078,881.57
  5. Step 5: Solve for x
    x = 1,078,881.57/1,136.20
  6. Step 6: Final answer
    x = 949.55

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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.