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Finding the Fourth Proportional to 849.16, 1,171.47 and 499.69

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Solution

The fourth proportional to 849.16, 1,171.47 and 499.69 is: 689.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.16 : 1,171.47 = 499.69 : x
  2. Step 2: Convert to fraction form
    849.16/1,171.47 = 499.69/x
  3. Step 3: Cross multiply
    849.16x = 1,171.47 × 499.69
  4. Step 4: Simplify right side
    849.16x = 585,371.84
  5. Step 5: Solve for x
    x = 585,371.84/849.16
  6. Step 6: Final answer
    x = 689.35

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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.