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Finding the Fourth Proportional to 103,640.10, 155,460.15 and 28,760.10

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Solution

The fourth proportional to 103,640.10, 155,460.15 and 28,760.10 is: 43,140.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,640.10 : 155,460.15 = 28,760.10 : x
  2. Step 2: Convert to fraction form
    103,640.10/155,460.15 = 28,760.10/x
  3. Step 3: Cross multiply
    103,640.10x = 155,460.15 × 28,760.10
  4. Step 4: Simplify right side
    103,640.10x = 4,471,049,460.02
  5. Step 5: Solve for x
    x = 4,471,049,460.02/103,640.10
  6. Step 6: Final answer
    x = 43,140.15

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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.