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Finding the Fourth Proportional to 874.80, 1,206.95 and 501.66

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Solution

The fourth proportional to 874.80, 1,206.95 and 501.66 is: 692.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,206.95 = 501.66 : x
  2. Step 2: Convert to fraction form
    874.80/1,206.95 = 501.66/x
  3. Step 3: Cross multiply
    874.80x = 1,206.95 × 501.66
  4. Step 4: Simplify right side
    874.80x = 605,476.03
  5. Step 5: Solve for x
    x = 605,476.03/874.80
  6. Step 6: Final answer
    x = 692.13

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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.