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Finding the Fourth Proportional to 30,403.80, 45,581.40 and 12,859.20

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Solution

The fourth proportional to 30,403.80, 45,581.40 and 12,859.20 is: 19,278.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,403.80 : 45,581.40 = 12,859.20 : x
  2. Step 2: Convert to fraction form
    30,403.80/45,581.40 = 12,859.20/x
  3. Step 3: Cross multiply
    30,403.80x = 45,581.40 × 12,859.20
  4. Step 4: Simplify right side
    30,403.80x = 586,140,338.88
  5. Step 5: Solve for x
    x = 586,140,338.88/30,403.80
  6. Step 6: Final answer
    x = 19,278.52

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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.