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Finding the Fourth Proportional to 971.06, 1,340.36 and 621.74

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Solution

The fourth proportional to 971.06, 1,340.36 and 621.74 is: 858.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.06 : 1,340.36 = 621.74 : x
  2. Step 2: Convert to fraction form
    971.06/1,340.36 = 621.74/x
  3. Step 3: Cross multiply
    971.06x = 1,340.36 × 621.74
  4. Step 4: Simplify right side
    971.06x = 833,355.43
  5. Step 5: Solve for x
    x = 833,355.43/971.06
  6. Step 6: Final answer
    x = 858.19

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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.