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Finding the Fourth Proportional to 420.75, 580.59 and 234.25

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Solution

The fourth proportional to 420.75, 580.59 and 234.25 is: 323.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.75 : 580.59 = 234.25 : x
  2. Step 2: Convert to fraction form
    420.75/580.59 = 234.25/x
  3. Step 3: Cross multiply
    420.75x = 580.59 × 234.25
  4. Step 4: Simplify right side
    420.75x = 136,001.76
  5. Step 5: Solve for x
    x = 136,001.76/420.75
  6. Step 6: Final answer
    x = 323.24

Related Problems

Find fourth proportional to 210.38, 290.30 and 117.12
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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.