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Finding the Fourth Proportional to 18,760.48, 28,140.16 and 4,720.48

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Solution

The fourth proportional to 18,760.48, 28,140.16 and 4,720.48 is: 7,080.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,760.48 : 28,140.16 = 4,720.48 : x
  2. Step 2: Convert to fraction form
    18,760.48/28,140.16 = 4,720.48/x
  3. Step 3: Cross multiply
    18,760.48x = 28,140.16 × 4,720.48
  4. Step 4: Simplify right side
    18,760.48x = 132,835,062.48
  5. Step 5: Solve for x
    x = 132,835,062.48/18,760.48
  6. Step 6: Final answer
    x = 7,080.58

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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.