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Finding the Fourth Proportional to 1,178.50, 1,766.07 and 561.70

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Solution

The fourth proportional to 1,178.50, 1,766.07 and 561.70 is: 841.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.50 : 1,766.07 = 561.70 : x
  2. Step 2: Convert to fraction form
    1,178.50/1,766.07 = 561.70/x
  3. Step 3: Cross multiply
    1,178.50x = 1,766.07 × 561.70
  4. Step 4: Simplify right side
    1,178.50x = 992,001.52
  5. Step 5: Solve for x
    x = 992,001.52/1,178.50
  6. Step 6: Final answer
    x = 841.75

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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.