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Finding the Fourth Proportional to 690.94, 1,036.42 and 177.94

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Solution

The fourth proportional to 690.94, 1,036.42 and 177.94 is: 266.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.94 : 1,036.42 = 177.94 : x
  2. Step 2: Convert to fraction form
    690.94/1,036.42 = 177.94/x
  3. Step 3: Cross multiply
    690.94x = 1,036.42 × 177.94
  4. Step 4: Simplify right side
    690.94x = 184,420.57
  5. Step 5: Solve for x
    x = 184,420.57/690.94
  6. Step 6: Final answer
    x = 266.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.