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Finding the Fourth Proportional to 740.67, 1,111.14 and 278.77

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Solution

The fourth proportional to 740.67, 1,111.14 and 278.77 is: 418.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.67 : 1,111.14 = 278.77 : x
  2. Step 2: Convert to fraction form
    740.67/1,111.14 = 278.77/x
  3. Step 3: Cross multiply
    740.67x = 1,111.14 × 278.77
  4. Step 4: Simplify right side
    740.67x = 309,752.50
  5. Step 5: Solve for x
    x = 309,752.50/740.67
  6. Step 6: Final answer
    x = 418.21

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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.