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Finding the Fourth Proportional to 1,189.61, 1,639.18 and 1,011.95

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Solution

The fourth proportional to 1,189.61, 1,639.18 and 1,011.95 is: 1,394.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.61 : 1,639.18 = 1,011.95 : x
  2. Step 2: Convert to fraction form
    1,189.61/1,639.18 = 1,011.95/x
  3. Step 3: Cross multiply
    1,189.61x = 1,639.18 × 1,011.95
  4. Step 4: Simplify right side
    1,189.61x = 1,658,768.20
  5. Step 5: Solve for x
    x = 1,658,768.20/1,189.61
  6. Step 6: Final answer
    x = 1,394.38

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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.