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Finding the Fourth Proportional to 70,347.78, 105,521.67 and 21,099.78

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Solution

The fourth proportional to 70,347.78, 105,521.67 and 21,099.78 is: 31,649.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,347.78 : 105,521.67 = 21,099.78 : x
  2. Step 2: Convert to fraction form
    70,347.78/105,521.67 = 21,099.78/x
  3. Step 3: Cross multiply
    70,347.78x = 105,521.67 × 21,099.78
  4. Step 4: Simplify right side
    70,347.78x = 2,226,484,022.23
  5. Step 5: Solve for x
    x = 2,226,484,022.23/70,347.78
  6. Step 6: Final answer
    x = 31,649.67

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.