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Finding the Fourth Proportional to 874.21, 1,206.30 and 501.15

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Solution

The fourth proportional to 874.21, 1,206.30 and 501.15 is: 691.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.21 : 1,206.30 = 501.15 : x
  2. Step 2: Convert to fraction form
    874.21/1,206.30 = 501.15/x
  3. Step 3: Cross multiply
    874.21x = 1,206.30 × 501.15
  4. Step 4: Simplify right side
    874.21x = 604,537.25
  5. Step 5: Solve for x
    x = 604,537.25/874.21
  6. Step 6: Final answer
    x = 691.52

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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.