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Finding the Fourth Proportional to 740.72, 1,110.47 and 431.81

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Solution

The fourth proportional to 740.72, 1,110.47 and 431.81 is: 647.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.72 : 1,110.47 = 431.81 : x
  2. Step 2: Convert to fraction form
    740.72/1,110.47 = 431.81/x
  3. Step 3: Cross multiply
    740.72x = 1,110.47 × 431.81
  4. Step 4: Simplify right side
    740.72x = 479,512.05
  5. Step 5: Solve for x
    x = 479,512.05/740.72
  6. Step 6: Final answer
    x = 647.36

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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.