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Finding the Fourth Proportional to 1,285.77, 1,927.11 and 915

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Solution

The fourth proportional to 1,285.77, 1,927.11 and 915 is: 1,371.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.77 : 1,927.11 = 915 : x
  2. Step 2: Convert to fraction form
    1,285.77/1,927.11 = 915/x
  3. Step 3: Cross multiply
    1,285.77x = 1,927.11 × 915
  4. Step 4: Simplify right side
    1,285.77x = 1,763,305.65
  5. Step 5: Solve for x
    x = 1,763,305.65/1,285.77
  6. Step 6: Final answer
    x = 1,371.40

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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.