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Finding the Fourth Proportional to 30,411.20, 45,616.80 and 19,913.60

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Solution

The fourth proportional to 30,411.20, 45,616.80 and 19,913.60 is: 29,870.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,411.20 : 45,616.80 = 19,913.60 : x
  2. Step 2: Convert to fraction form
    30,411.20/45,616.80 = 19,913.60/x
  3. Step 3: Cross multiply
    30,411.20x = 45,616.80 × 19,913.60
  4. Step 4: Simplify right side
    30,411.20x = 908,394,708.48
  5. Step 5: Solve for x
    x = 908,394,708.48/30,411.20
  6. Step 6: Final answer
    x = 29,870.40

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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.