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Finding the Fourth Proportional to 740.99, 1,111.49 and 278.75

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Solution

The fourth proportional to 740.99, 1,111.49 and 278.75 is: 418.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.99 : 1,111.49 = 278.75 : x
  2. Step 2: Convert to fraction form
    740.99/1,111.49 = 278.75/x
  3. Step 3: Cross multiply
    740.99x = 1,111.49 × 278.75
  4. Step 4: Simplify right side
    740.99x = 309,830.27
  5. Step 5: Solve for x
    x = 309,830.27/740.99
  6. Step 6: Final answer
    x = 418.13

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Double scale
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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.