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Finding the Fourth Proportional to 521.93, 720 and 345.20

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Solution

The fourth proportional to 521.93, 720 and 345.20 is: 476.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.93 : 720 = 345.20 : x
  2. Step 2: Convert to fraction form
    521.93/720 = 345.20/x
  3. Step 3: Cross multiply
    521.93x = 720 × 345.20
  4. Step 4: Simplify right side
    521.93x = 248,540.40
  5. Step 5: Solve for x
    x = 248,540.40/521.93
  6. Step 6: Final answer
    x = 476.20

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Double scale
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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.