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Finding the Fourth Proportional to 971.01, 1,340.44 and 621.90

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Solution

The fourth proportional to 971.01, 1,340.44 and 621.90 is: 858.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.01 : 1,340.44 = 621.90 : x
  2. Step 2: Convert to fraction form
    971.01/1,340.44 = 621.90/x
  3. Step 3: Cross multiply
    971.01x = 1,340.44 × 621.90
  4. Step 4: Simplify right side
    971.01x = 833,618.08
  5. Step 5: Solve for x
    x = 833,618.08/971.01
  6. Step 6: Final answer
    x = 858.51

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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.