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Finding the Fourth Proportional to 838.31, 1,154.39 and 719.42

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Solution

The fourth proportional to 838.31, 1,154.39 and 719.42 is: 990.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.31 : 1,154.39 = 719.42 : x
  2. Step 2: Convert to fraction form
    838.31/1,154.39 = 719.42/x
  3. Step 3: Cross multiply
    838.31x = 1,154.39 × 719.42
  4. Step 4: Simplify right side
    838.31x = 830,481.88
  5. Step 5: Solve for x
    x = 830,481.88/838.31
  6. Step 6: Final answer
    x = 990.67

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1.5x scale

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.