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Finding the Fourth Proportional to 740.66, 1,111.08 and 393.98

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Solution

The fourth proportional to 740.66, 1,111.08 and 393.98 is: 591.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.66 : 1,111.08 = 393.98 : x
  2. Step 2: Convert to fraction form
    740.66/1,111.08 = 393.98/x
  3. Step 3: Cross multiply
    740.66x = 1,111.08 × 393.98
  4. Step 4: Simplify right side
    740.66x = 437,739.22
  5. Step 5: Solve for x
    x = 437,739.22/740.66
  6. Step 6: Final answer
    x = 591.02

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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.