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Finding the Fourth Proportional to 758.32, 1,138.88 and 621.68

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Solution

The fourth proportional to 758.32, 1,138.88 and 621.68 is: 933.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.32 : 1,138.88 = 621.68 : x
  2. Step 2: Convert to fraction form
    758.32/1,138.88 = 621.68/x
  3. Step 3: Cross multiply
    758.32x = 1,138.88 × 621.68
  4. Step 4: Simplify right side
    758.32x = 708,018.92
  5. Step 5: Solve for x
    x = 708,018.92/758.32
  6. Step 6: Final answer
    x = 933.67

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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.