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Finding the Fourth Proportional to 521.79, 720.26 and 347.19

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Solution

The fourth proportional to 521.79, 720.26 and 347.19 is: 479.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.79 : 720.26 = 347.19 : x
  2. Step 2: Convert to fraction form
    521.79/720.26 = 347.19/x
  3. Step 3: Cross multiply
    521.79x = 720.26 × 347.19
  4. Step 4: Simplify right side
    521.79x = 250,065.33
  5. Step 5: Solve for x
    x = 250,065.33/521.79
  6. Step 6: Final answer
    x = 479.25

Related Problems

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Half scale
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Double scale
Find fourth proportional to 522.79, 721.64 and 348.19
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.