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Finding the Fourth Proportional to 1,111.76, 1,534.40 and 719.20

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Solution

The fourth proportional to 1,111.76, 1,534.40 and 719.20 is: 992.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.76 : 1,534.40 = 719.20 : x
  2. Step 2: Convert to fraction form
    1,111.76/1,534.40 = 719.20/x
  3. Step 3: Cross multiply
    1,111.76x = 1,534.40 × 719.20
  4. Step 4: Simplify right side
    1,111.76x = 1,103,540.48
  5. Step 5: Solve for x
    x = 1,103,540.48/1,111.76
  6. Step 6: Final answer
    x = 992.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.