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Finding the Fourth Proportional to 501.83, 692.55 and 280.78

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Solution

The fourth proportional to 501.83, 692.55 and 280.78 is: 387.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.83 : 692.55 = 280.78 : x
  2. Step 2: Convert to fraction form
    501.83/692.55 = 280.78/x
  3. Step 3: Cross multiply
    501.83x = 692.55 × 280.78
  4. Step 4: Simplify right side
    501.83x = 194,454.19
  5. Step 5: Solve for x
    x = 194,454.19/501.83
  6. Step 6: Final answer
    x = 387.49

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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.