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Finding the Fourth Proportional to 521.79, 720.06 and 300.75

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Solution

The fourth proportional to 521.79, 720.06 and 300.75 is: 415.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.79 : 720.06 = 300.75 : x
  2. Step 2: Convert to fraction form
    521.79/720.06 = 300.75/x
  3. Step 3: Cross multiply
    521.79x = 720.06 × 300.75
  4. Step 4: Simplify right side
    521.79x = 216,558.05
  5. Step 5: Solve for x
    x = 216,558.05/521.79
  6. Step 6: Final answer
    x = 415.03

Related Problems

Find fourth proportional to 260.90, 360.03 and 150.38
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Double scale
Find fourth proportional to 522.79, 721.44 and 301.75
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.