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Finding the Fourth Proportional to 5.21, 7.20 and 4.76

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Solution

The fourth proportional to 5.21, 7.20 and 4.76 is: 6.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.21 : 7.20 = 4.76 : x
  2. Step 2: Convert to fraction form
    5.21/7.20 = 4.76/x
  3. Step 3: Cross multiply
    5.21x = 7.20 × 4.76
  4. Step 4: Simplify right side
    5.21x = 34.26
  5. Step 5: Solve for x
    x = 34.26/5.21
  6. Step 6: Final answer
    x = 6.58

Related Problems

Find fourth proportional to 2.60, 3.60 and 2.38
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.