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Finding the Fourth Proportional to 3,006.63, 4,509.90 and 815.40

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Solution

The fourth proportional to 3,006.63, 4,509.90 and 815.40 is: 1,223.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,006.63 : 4,509.90 = 815.40 : x
  2. Step 2: Convert to fraction form
    3,006.63/4,509.90 = 815.40/x
  3. Step 3: Cross multiply
    3,006.63x = 4,509.90 × 815.40
  4. Step 4: Simplify right side
    3,006.63x = 3,677,372.46
  5. Step 5: Solve for x
    x = 3,677,372.46/3,006.63
  6. Step 6: Final answer
    x = 1,223.09

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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.