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Finding the Fourth Proportional to 740.82, 1,111.05 and 278.64

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Solution

The fourth proportional to 740.82, 1,111.05 and 278.64 is: 417.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.82 : 1,111.05 = 278.64 : x
  2. Step 2: Convert to fraction form
    740.82/1,111.05 = 278.64/x
  3. Step 3: Cross multiply
    740.82x = 1,111.05 × 278.64
  4. Step 4: Simplify right side
    740.82x = 309,582.97
  5. Step 5: Solve for x
    x = 309,582.97/740.82
  6. Step 6: Final answer
    x = 417.89

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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.