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Finding the Fourth Proportional to 628.47, 867.30 and 348.75

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Solution

The fourth proportional to 628.47, 867.30 and 348.75 is: 481.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.47 : 867.30 = 348.75 : x
  2. Step 2: Convert to fraction form
    628.47/867.30 = 348.75/x
  3. Step 3: Cross multiply
    628.47x = 867.30 × 348.75
  4. Step 4: Simplify right side
    628.47x = 302,472.18
  5. Step 5: Solve for x
    x = 302,472.18/628.47
  6. Step 6: Final answer
    x = 481.28

Related Problems

Find fourth proportional to 314.24, 433.65 and 174.38
Half scale
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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.