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Finding the Fourth Proportional to 138,803.60, 208,205.40 and 123,640.40

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Solution

The fourth proportional to 138,803.60, 208,205.40 and 123,640.40 is: 185,460.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,803.60 : 208,205.40 = 123,640.40 : x
  2. Step 2: Convert to fraction form
    138,803.60/208,205.40 = 123,640.40/x
  3. Step 3: Cross multiply
    138,803.60x = 208,205.40 × 123,640.40
  4. Step 4: Simplify right side
    138,803.60x = 25,742,598,938.16
  5. Step 5: Solve for x
    x = 25,742,598,938.16/138,803.60
  6. Step 6: Final answer
    x = 185,460.60

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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.