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Finding the Fourth Proportional to 667.47, 920.65 and 612.39

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Solution

The fourth proportional to 667.47, 920.65 and 612.39 is: 844.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.47 : 920.65 = 612.39 : x
  2. Step 2: Convert to fraction form
    667.47/920.65 = 612.39/x
  3. Step 3: Cross multiply
    667.47x = 920.65 × 612.39
  4. Step 4: Simplify right side
    667.47x = 563,793.79
  5. Step 5: Solve for x
    x = 563,793.79/667.47
  6. Step 6: Final answer
    x = 844.67

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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.