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Finding the Fourth Proportional to 1,288.65, 1,932.57 and 741.09

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Solution

The fourth proportional to 1,288.65, 1,932.57 and 741.09 is: 1,111.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.65 : 1,932.57 = 741.09 : x
  2. Step 2: Convert to fraction form
    1,288.65/1,932.57 = 741.09/x
  3. Step 3: Cross multiply
    1,288.65x = 1,932.57 × 741.09
  4. Step 4: Simplify right side
    1,288.65x = 1,432,208.30
  5. Step 5: Solve for x
    x = 1,432,208.30/1,288.65
  6. Step 6: Final answer
    x = 1,111.40

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1.5x scale

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.