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Finding the Fourth Proportional to 721.35, 993.45 and 670.32

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Solution

The fourth proportional to 721.35, 993.45 and 670.32 is: 923.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.35 : 993.45 = 670.32 : x
  2. Step 2: Convert to fraction form
    721.35/993.45 = 670.32/x
  3. Step 3: Cross multiply
    721.35x = 993.45 × 670.32
  4. Step 4: Simplify right side
    721.35x = 665,929.40
  5. Step 5: Solve for x
    x = 665,929.40/721.35
  6. Step 6: Final answer
    x = 923.17

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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.