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Finding the Fourth Proportional to 1,006.10, 1,505.55 and 919.70

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Solution

The fourth proportional to 1,006.10, 1,505.55 and 919.70 is: 1,376.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.10 : 1,505.55 = 919.70 : x
  2. Step 2: Convert to fraction form
    1,006.10/1,505.55 = 919.70/x
  3. Step 3: Cross multiply
    1,006.10x = 1,505.55 × 919.70
  4. Step 4: Simplify right side
    1,006.10x = 1,384,654.34
  5. Step 5: Solve for x
    x = 1,384,654.34/1,006.10
  6. Step 6: Final answer
    x = 1,376.26

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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.