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Finding the Fourth Proportional to 761.13, 1,139.64 and 395.16

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Solution

The fourth proportional to 761.13, 1,139.64 and 395.16 is: 591.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.13 : 1,139.64 = 395.16 : x
  2. Step 2: Convert to fraction form
    761.13/1,139.64 = 395.16/x
  3. Step 3: Cross multiply
    761.13x = 1,139.64 × 395.16
  4. Step 4: Simplify right side
    761.13x = 450,340.14
  5. Step 5: Solve for x
    x = 450,340.14/761.13
  6. Step 6: Final answer
    x = 591.67

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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.