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Finding the Fourth Proportional to 28,130.80, 42,169.80 and 10,612.40

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Solution

The fourth proportional to 28,130.80, 42,169.80 and 10,612.40 is: 15,908.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,130.80 : 42,169.80 = 10,612.40 : x
  2. Step 2: Convert to fraction form
    28,130.80/42,169.80 = 10,612.40/x
  3. Step 3: Cross multiply
    28,130.80x = 42,169.80 × 10,612.40
  4. Step 4: Simplify right side
    28,130.80x = 447,522,785.52
  5. Step 5: Solve for x
    x = 447,522,785.52/28,130.80
  6. Step 6: Final answer
    x = 15,908.64

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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.