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Finding the Fourth Proportional to 740.06, 1,109.77 and 393.31

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Solution

The fourth proportional to 740.06, 1,109.77 and 393.31 is: 589.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.06 : 1,109.77 = 393.31 : x
  2. Step 2: Convert to fraction form
    740.06/1,109.77 = 393.31/x
  3. Step 3: Cross multiply
    740.06x = 1,109.77 × 393.31
  4. Step 4: Simplify right side
    740.06x = 436,487.11
  5. Step 5: Solve for x
    x = 436,487.11/740.06
  6. Step 6: Final answer
    x = 589.80

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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.