Home / 1,186.16-1,637.28-720.80

Finding the Fourth Proportional to 1,186.16, 1,637.28 and 720.80

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Solution

The fourth proportional to 1,186.16, 1,637.28 and 720.80 is: 994.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.16 : 1,637.28 = 720.80 : x
  2. Step 2: Convert to fraction form
    1,186.16/1,637.28 = 720.80/x
  3. Step 3: Cross multiply
    1,186.16x = 1,637.28 × 720.80
  4. Step 4: Simplify right side
    1,186.16x = 1,180,151.42
  5. Step 5: Solve for x
    x = 1,180,151.42/1,186.16
  6. Step 6: Final answer
    x = 994.93

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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.