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Finding the Fourth Proportional to 21,411.20, 32,116.80 and 10,913.60

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Solution

The fourth proportional to 21,411.20, 32,116.80 and 10,913.60 is: 16,370.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,411.20 : 32,116.80 = 10,913.60 : x
  2. Step 2: Convert to fraction form
    21,411.20/32,116.80 = 10,913.60/x
  3. Step 3: Cross multiply
    21,411.20x = 32,116.80 × 10,913.60
  4. Step 4: Simplify right side
    21,411.20x = 350,509,908.48
  5. Step 5: Solve for x
    x = 350,509,908.48/21,411.20
  6. Step 6: Final answer
    x = 16,370.40

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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.