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Finding the Fourth Proportional to 501.74, 692.39 and 280.69

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Solution

The fourth proportional to 501.74, 692.39 and 280.69 is: 387.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.74 : 692.39 = 280.69 : x
  2. Step 2: Convert to fraction form
    501.74/692.39 = 280.69/x
  3. Step 3: Cross multiply
    501.74x = 692.39 × 280.69
  4. Step 4: Simplify right side
    501.74x = 194,346.95
  5. Step 5: Solve for x
    x = 194,346.95/501.74
  6. Step 6: Final answer
    x = 387.35

Related Problems

Find fourth proportional to 250.87, 346.20 and 140.35
Half scale
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Double scale
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Similar ratio
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1.5x scale

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.