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Finding the Fourth Proportional to 670.74, 1,006.16 and 621.56

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Solution

The fourth proportional to 670.74, 1,006.16 and 621.56 is: 932.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.74 : 1,006.16 = 621.56 : x
  2. Step 2: Convert to fraction form
    670.74/1,006.16 = 621.56/x
  3. Step 3: Cross multiply
    670.74x = 1,006.16 × 621.56
  4. Step 4: Simplify right side
    670.74x = 625,380.67
  5. Step 5: Solve for x
    x = 625,380.67/670.74
  6. Step 6: Final answer
    x = 932.37

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1.5x scale

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.