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Finding the Fourth Proportional to 987.17, 1,361.47 and 739.08

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Solution

The fourth proportional to 987.17, 1,361.47 and 739.08 is: 1,019.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.17 : 1,361.47 = 739.08 : x
  2. Step 2: Convert to fraction form
    987.17/1,361.47 = 739.08/x
  3. Step 3: Cross multiply
    987.17x = 1,361.47 × 739.08
  4. Step 4: Simplify right side
    987.17x = 1,006,235.25
  5. Step 5: Solve for x
    x = 1,006,235.25/987.17
  6. Step 6: Final answer
    x = 1,019.31

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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.