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Finding the Fourth Proportional to 670.07, 1,005.41 and 642.74

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Solution

The fourth proportional to 670.07, 1,005.41 and 642.74 is: 964.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.07 : 1,005.41 = 642.74 : x
  2. Step 2: Convert to fraction form
    670.07/1,005.41 = 642.74/x
  3. Step 3: Cross multiply
    670.07x = 1,005.41 × 642.74
  4. Step 4: Simplify right side
    670.07x = 646,213.80
  5. Step 5: Solve for x
    x = 646,213.80/670.07
  6. Step 6: Final answer
    x = 964.39

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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.