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Finding the Fourth Proportional to 154,298.97, 212,905.80 and 90,649.98

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Solution

The fourth proportional to 154,298.97, 212,905.80 and 90,649.98 is: 125,081.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,298.97 : 212,905.80 = 90,649.98 : x
  2. Step 2: Convert to fraction form
    154,298.97/212,905.80 = 90,649.98/x
  3. Step 3: Cross multiply
    154,298.97x = 212,905.80 × 90,649.98
  4. Step 4: Simplify right side
    154,298.97x = 19,299,906,511.88
  5. Step 5: Solve for x
    x = 19,299,906,511.88/154,298.97
  6. Step 6: Final answer
    x = 125,081.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.