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Finding the Fourth Proportional to 15.70, 22 and 15.70

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Solution

The fourth proportional to 15.70, 22 and 15.70 is: 22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.70 : 22 = 15.70 : x
  2. Step 2: Convert to fraction form
    15.70/22 = 15.70/x
  3. Step 3: Cross multiply
    15.70x = 22 × 15.70
  4. Step 4: Simplify right side
    15.70x = 345.40
  5. Step 5: Solve for x
    x = 345.40/15.70
  6. Step 6: Final answer
    x = 22

Related Problems

Find fourth proportional to 7.85, 11 and 7.85
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 (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.