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Finding the Fourth Proportional to 30,286.80, 45,430.20 and 21,992.40

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Solution

The fourth proportional to 30,286.80, 45,430.20 and 21,992.40 is: 32,988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,286.80 : 45,430.20 = 21,992.40 : x
  2. Step 2: Convert to fraction form
    30,286.80/45,430.20 = 21,992.40/x
  3. Step 3: Cross multiply
    30,286.80x = 45,430.20 × 21,992.40
  4. Step 4: Simplify right side
    30,286.80x = 999,119,130.48
  5. Step 5: Solve for x
    x = 999,119,130.48/30,286.80
  6. Step 6: Final answer
    x = 32,988.60

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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.