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Finding the Fourth Proportional to 1,106.70, 1,660.05 and 986.46

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Solution

The fourth proportional to 1,106.70, 1,660.05 and 986.46 is: 1,479.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.70 : 1,660.05 = 986.46 : x
  2. Step 2: Convert to fraction form
    1,106.70/1,660.05 = 986.46/x
  3. Step 3: Cross multiply
    1,106.70x = 1,660.05 × 986.46
  4. Step 4: Simplify right side
    1,106.70x = 1,637,572.92
  5. Step 5: Solve for x
    x = 1,637,572.92/1,106.70
  6. Step 6: Final answer
    x = 1,479.69

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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.