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Finding the Fourth Proportional to 628.92, 867.36 and 481.20

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Solution

The fourth proportional to 628.92, 867.36 and 481.20 is: 663.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.92 : 867.36 = 481.20 : x
  2. Step 2: Convert to fraction form
    628.92/867.36 = 481.20/x
  3. Step 3: Cross multiply
    628.92x = 867.36 × 481.20
  4. Step 4: Simplify right side
    628.92x = 417,373.63
  5. Step 5: Solve for x
    x = 417,373.63/628.92
  6. Step 6: Final answer
    x = 663.64

Related Problems

Find fourth proportional to 314.46, 433.68 and 240.60
Half scale
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Double scale
Find fourth proportional to 629.92, 868.74 and 482.20
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.