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Finding the Fourth Proportional to 1,140.70, 1,711.05 and 986.80

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Solution

The fourth proportional to 1,140.70, 1,711.05 and 986.80 is: 1,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.70 : 1,711.05 = 986.80 : x
  2. Step 2: Convert to fraction form
    1,140.70/1,711.05 = 986.80/x
  3. Step 3: Cross multiply
    1,140.70x = 1,711.05 × 986.80
  4. Step 4: Simplify right side
    1,140.70x = 1,688,464.14
  5. Step 5: Solve for x
    x = 1,688,464.14/1,140.70
  6. Step 6: Final answer
    x = 1,480.20

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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.