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Finding the Fourth Proportional to 138,712.60, 208,068.90 and 122,642.20

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Solution

The fourth proportional to 138,712.60, 208,068.90 and 122,642.20 is: 183,963.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,712.60 : 208,068.90 = 122,642.20 : x
  2. Step 2: Convert to fraction form
    138,712.60/208,068.90 = 122,642.20/x
  3. Step 3: Cross multiply
    138,712.60x = 208,068.90 × 122,642.20
  4. Step 4: Simplify right side
    138,712.60x = 25,518,027,647.58
  5. Step 5: Solve for x
    x = 25,518,027,647.58/138,712.60
  6. Step 6: Final answer
    x = 183,963.30

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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.