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Finding the Fourth Proportional to 1,404.65, 1,938.12 and 815.11

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Solution

The fourth proportional to 1,404.65, 1,938.12 and 815.11 is: 1,124.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,404.65 : 1,938.12 = 815.11 : x
  2. Step 2: Convert to fraction form
    1,404.65/1,938.12 = 815.11/x
  3. Step 3: Cross multiply
    1,404.65x = 1,938.12 × 815.11
  4. Step 4: Simplify right side
    1,404.65x = 1,579,780.99
  5. Step 5: Solve for x
    x = 1,579,780.99/1,404.65
  6. Step 6: Final answer
    x = 1,124.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.