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Finding the Fourth Proportional to 28,512.80, 42,812.40 and 21,946.40

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Solution

The fourth proportional to 28,512.80, 42,812.40 and 21,946.40 is: 32,952.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,512.80 : 42,812.40 = 21,946.40 : x
  2. Step 2: Convert to fraction form
    28,512.80/42,812.40 = 21,946.40/x
  3. Step 3: Cross multiply
    28,512.80x = 42,812.40 × 21,946.40
  4. Step 4: Simplify right side
    28,512.80x = 939,578,055.36
  5. Step 5: Solve for x
    x = 939,578,055.36/28,512.80
  6. Step 6: Final answer
    x = 32,952.85

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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.