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Finding the Fourth Proportional to 740.87, 1,111.37 and 253.80

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Solution

The fourth proportional to 740.87, 1,111.37 and 253.80 is: 380.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.87 : 1,111.37 = 253.80 : x
  2. Step 2: Convert to fraction form
    740.87/1,111.37 = 253.80/x
  3. Step 3: Cross multiply
    740.87x = 1,111.37 × 253.80
  4. Step 4: Simplify right side
    740.87x = 282,065.71
  5. Step 5: Solve for x
    x = 282,065.71/740.87
  6. Step 6: Final answer
    x = 380.72

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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.