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Finding the Fourth Proportional to 18,752.70, 28,128.78 and 4,901.70

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Solution

The fourth proportional to 18,752.70, 28,128.78 and 4,901.70 is: 7,352.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,752.70 : 28,128.78 = 4,901.70 : x
  2. Step 2: Convert to fraction form
    18,752.70/28,128.78 = 4,901.70/x
  3. Step 3: Cross multiply
    18,752.70x = 28,128.78 × 4,901.70
  4. Step 4: Simplify right side
    18,752.70x = 137,878,840.93
  5. Step 5: Solve for x
    x = 137,878,840.93/18,752.70
  6. Step 6: Final answer
    x = 7,352.48

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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.