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Finding the Fourth Proportional to 740.71, 1,111.07 and 253.77

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Solution

The fourth proportional to 740.71, 1,111.07 and 253.77 is: 380.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.71 : 1,111.07 = 253.77 : x
  2. Step 2: Convert to fraction form
    740.71/1,111.07 = 253.77/x
  3. Step 3: Cross multiply
    740.71x = 1,111.07 × 253.77
  4. Step 4: Simplify right side
    740.71x = 281,956.23
  5. Step 5: Solve for x
    x = 281,956.23/740.71
  6. Step 6: Final answer
    x = 380.66

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1.5x scale

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.