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Finding the Fourth Proportional to 30,280.80, 45,421.20 and 21,986.40

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Solution

The fourth proportional to 30,280.80, 45,421.20 and 21,986.40 is: 32,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,280.80 : 45,421.20 = 21,986.40 : x
  2. Step 2: Convert to fraction form
    30,280.80/45,421.20 = 21,986.40/x
  3. Step 3: Cross multiply
    30,280.80x = 45,421.20 × 21,986.40
  4. Step 4: Simplify right side
    30,280.80x = 998,648,671.68
  5. Step 5: Solve for x
    x = 998,648,671.68/30,280.80
  6. Step 6: Final answer
    x = 32,979.60

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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.