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Finding the Fourth Proportional to 521.84, 720.19 and 300.79

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Solution

The fourth proportional to 521.84, 720.19 and 300.79 is: 415.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.84 : 720.19 = 300.79 : x
  2. Step 2: Convert to fraction form
    521.84/720.19 = 300.79/x
  3. Step 3: Cross multiply
    521.84x = 720.19 × 300.79
  4. Step 4: Simplify right side
    521.84x = 216,625.20
  5. Step 5: Solve for x
    x = 216,625.20/521.84
  6. Step 6: Final answer
    x = 415.12

Related Problems

Find fourth proportional to 260.92, 360.10 and 150.39
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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.