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Finding the Fourth Proportional to 645.24, 971.70 and 581.00

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Solution

The fourth proportional to 645.24, 971.70 and 581.00 is: 874.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.24 : 971.70 = 581.00 : x
  2. Step 2: Convert to fraction form
    645.24/971.70 = 581.00/x
  3. Step 3: Cross multiply
    645.24x = 971.70 × 581.00
  4. Step 4: Simplify right side
    645.24x = 564,553.40
  5. Step 5: Solve for x
    x = 564,553.40/645.24
  6. Step 6: Final answer
    x = 874.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.