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Finding the Fourth Proportional to 987.18, 1,362.11 and 751.07

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Solution

The fourth proportional to 987.18, 1,362.11 and 751.07 is: 1,036.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.18 : 1,362.11 = 751.07 : x
  2. Step 2: Convert to fraction form
    987.18/1,362.11 = 751.07/x
  3. Step 3: Cross multiply
    987.18x = 1,362.11 × 751.07
  4. Step 4: Simplify right side
    987.18x = 1,023,032.21
  5. Step 5: Solve for x
    x = 1,023,032.21/987.18
  6. Step 6: Final answer
    x = 1,036.32

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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.