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Finding the Fourth Proportional to 740.45, 1,110.69 and 253.50

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Solution

The fourth proportional to 740.45, 1,110.69 and 253.50 is: 380.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.45 : 1,110.69 = 253.50 : x
  2. Step 2: Convert to fraction form
    740.45/1,110.69 = 253.50/x
  3. Step 3: Cross multiply
    740.45x = 1,110.69 × 253.50
  4. Step 4: Simplify right side
    740.45x = 281,559.92
  5. Step 5: Solve for x
    x = 281,559.92/740.45
  6. Step 6: Final answer
    x = 380.26

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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.