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Finding the Fourth Proportional to 740.84, 1,111.46 and 253.89

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Solution

The fourth proportional to 740.84, 1,111.46 and 253.89 is: 380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.84 : 1,111.46 = 253.89 : x
  2. Step 2: Convert to fraction form
    740.84/1,111.46 = 253.89/x
  3. Step 3: Cross multiply
    740.84x = 1,111.46 × 253.89
  4. Step 4: Simplify right side
    740.84x = 282,187.31
  5. Step 5: Solve for x
    x = 282,187.31/740.84
  6. Step 6: Final answer
    x = 380.90

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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.