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Finding the Fourth Proportional to 670.36, 1,003.56 and 653.80

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Solution

The fourth proportional to 670.36, 1,003.56 and 653.80 is: 978.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.36 : 1,003.56 = 653.80 : x
  2. Step 2: Convert to fraction form
    670.36/1,003.56 = 653.80/x
  3. Step 3: Cross multiply
    670.36x = 1,003.56 × 653.80
  4. Step 4: Simplify right side
    670.36x = 656,127.53
  5. Step 5: Solve for x
    x = 656,127.53/670.36
  6. Step 6: Final answer
    x = 978.77

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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.