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Finding the Fourth Proportional to 740.08, 1,111.20 and 451.72

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Solution

The fourth proportional to 740.08, 1,111.20 and 451.72 is: 678.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.08 : 1,111.20 = 451.72 : x
  2. Step 2: Convert to fraction form
    740.08/1,111.20 = 451.72/x
  3. Step 3: Cross multiply
    740.08x = 1,111.20 × 451.72
  4. Step 4: Simplify right side
    740.08x = 501,951.26
  5. Step 5: Solve for x
    x = 501,951.26/740.08
  6. Step 6: Final answer
    x = 678.24

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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.