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Finding the Fourth Proportional to 987.08, 1,361.93 and 650.94

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Solution

The fourth proportional to 987.08, 1,361.93 and 650.94 is: 898.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.08 : 1,361.93 = 650.94 : x
  2. Step 2: Convert to fraction form
    987.08/1,361.93 = 650.94/x
  3. Step 3: Cross multiply
    987.08x = 1,361.93 × 650.94
  4. Step 4: Simplify right side
    987.08x = 886,534.71
  5. Step 5: Solve for x
    x = 886,534.71/987.08
  6. Step 6: Final answer
    x = 898.14

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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.