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Finding the Fourth Proportional to 21,196.80, 31,762.80 and 20,030.40

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Solution

The fourth proportional to 21,196.80, 31,762.80 and 20,030.40 is: 30,014.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,196.80 : 31,762.80 = 20,030.40 : x
  2. Step 2: Convert to fraction form
    21,196.80/31,762.80 = 20,030.40/x
  3. Step 3: Cross multiply
    21,196.80x = 31,762.80 × 20,030.40
  4. Step 4: Simplify right side
    21,196.80x = 636,221,589.12
  5. Step 5: Solve for x
    x = 636,221,589.12/21,196.80
  6. Step 6: Final answer
    x = 30,014.98

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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.