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Finding the Fourth Proportional to 521.66, 720.70 and 485.22

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Solution

The fourth proportional to 521.66, 720.70 and 485.22 is: 670.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.66 : 720.70 = 485.22 : x
  2. Step 2: Convert to fraction form
    521.66/720.70 = 485.22/x
  3. Step 3: Cross multiply
    521.66x = 720.70 × 485.22
  4. Step 4: Simplify right side
    521.66x = 349,698.05
  5. Step 5: Solve for x
    x = 349,698.05/521.66
  6. Step 6: Final answer
    x = 670.36

Related Problems

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Double scale
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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.