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Finding the Fourth Proportional to 765.46, 1,055.86 and 667.45

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Solution

The fourth proportional to 765.46, 1,055.86 and 667.45 is: 920.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.46 : 1,055.86 = 667.45 : x
  2. Step 2: Convert to fraction form
    765.46/1,055.86 = 667.45/x
  3. Step 3: Cross multiply
    765.46x = 1,055.86 × 667.45
  4. Step 4: Simplify right side
    765.46x = 704,733.76
  5. Step 5: Solve for x
    x = 704,733.76/765.46
  6. Step 6: Final answer
    x = 920.67

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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.