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Finding the Fourth Proportional to 1,438.68, 1,985.28 and 849.16

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Solution

The fourth proportional to 1,438.68, 1,985.28 and 849.16 is: 1,171.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.68 : 1,985.28 = 849.16 : x
  2. Step 2: Convert to fraction form
    1,438.68/1,985.28 = 849.16/x
  3. Step 3: Cross multiply
    1,438.68x = 1,985.28 × 849.16
  4. Step 4: Simplify right side
    1,438.68x = 1,685,820.36
  5. Step 5: Solve for x
    x = 1,685,820.36/1,438.68
  6. Step 6: Final answer
    x = 1,171.78

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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.