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Finding the Fourth Proportional to 21,870.67, 32,811.20 and 7,079.58

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Solution

The fourth proportional to 21,870.67, 32,811.20 and 7,079.58 is: 10,621.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,870.67 : 32,811.20 = 7,079.58 : x
  2. Step 2: Convert to fraction form
    21,870.67/32,811.20 = 7,079.58/x
  3. Step 3: Cross multiply
    21,870.67x = 32,811.20 × 7,079.58
  4. Step 4: Simplify right side
    21,870.67x = 232,289,515.30
  5. Step 5: Solve for x
    x = 232,289,515.30/21,870.67
  6. Step 6: Final answer
    x = 10,621.05

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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.