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Finding the Fourth Proportional to 521.72, 720.03 and 300.75

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Solution

The fourth proportional to 521.72, 720.03 and 300.75 is: 415.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 720.03 = 300.75 : x
  2. Step 2: Convert to fraction form
    521.72/720.03 = 300.75/x
  3. Step 3: Cross multiply
    521.72x = 720.03 × 300.75
  4. Step 4: Simplify right side
    521.72x = 216,549.02
  5. Step 5: Solve for x
    x = 216,549.02/521.72
  6. Step 6: Final answer
    x = 415.07

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Find fourth proportional to 260.86, 360.02 and 150.38
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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.