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Finding the Fourth Proportional to 480.66, 724.26 and 428.28

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Solution

The fourth proportional to 480.66, 724.26 and 428.28 is: 645.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.66 : 724.26 = 428.28 : x
  2. Step 2: Convert to fraction form
    480.66/724.26 = 428.28/x
  3. Step 3: Cross multiply
    480.66x = 724.26 × 428.28
  4. Step 4: Simplify right side
    480.66x = 310,186.07
  5. Step 5: Solve for x
    x = 310,186.07/480.66
  6. Step 6: Final answer
    x = 645.33

Related Problems

Find fourth proportional to 240.33, 362.13 and 214.14
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.