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Finding the Fourth Proportional to 21,830.40, 32,729.40 and 7,030.80

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Solution

The fourth proportional to 21,830.40, 32,729.40 and 7,030.80 is: 10,540.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,830.40 : 32,729.40 = 7,030.80 : x
  2. Step 2: Convert to fraction form
    21,830.40/32,729.40 = 7,030.80/x
  3. Step 3: Cross multiply
    21,830.40x = 32,729.40 × 7,030.80
  4. Step 4: Simplify right side
    21,830.40x = 230,113,865.52
  5. Step 5: Solve for x
    x = 230,113,865.52/21,830.40
  6. Step 6: Final answer
    x = 10,540.98

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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.