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Finding the Fourth Proportional to 1,188.42, 1,639.65 and 690.96

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Solution

The fourth proportional to 1,188.42, 1,639.65 and 690.96 is: 953.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.42 : 1,639.65 = 690.96 : x
  2. Step 2: Convert to fraction form
    1,188.42/1,639.65 = 690.96/x
  3. Step 3: Cross multiply
    1,188.42x = 1,639.65 × 690.96
  4. Step 4: Simplify right side
    1,188.42x = 1,132,929.11
  5. Step 5: Solve for x
    x = 1,132,929.11/1,188.42
  6. Step 6: Final answer
    x = 953.31

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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.