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Finding the Fourth Proportional to 740.63, 1,111.13 and 278.46

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Solution

The fourth proportional to 740.63, 1,111.13 and 278.46 is: 417.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.63 : 1,111.13 = 278.46 : x
  2. Step 2: Convert to fraction form
    740.63/1,111.13 = 278.46/x
  3. Step 3: Cross multiply
    740.63x = 1,111.13 × 278.46
  4. Step 4: Simplify right side
    740.63x = 309,405.26
  5. Step 5: Solve for x
    x = 309,405.26/740.63
  6. Step 6: Final answer
    x = 417.76

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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.