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Finding the Fourth Proportional to 153,920, 212,444.96 and 90,278.30

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Solution

The fourth proportional to 153,920, 212,444.96 and 90,278.30 is: 124,604.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,920 : 212,444.96 = 90,278.30 : x
  2. Step 2: Convert to fraction form
    153,920/212,444.96 = 90,278.30/x
  3. Step 3: Cross multiply
    153,920x = 212,444.96 × 90,278.30
  4. Step 4: Simplify right side
    153,920x = 19,179,169,832.37
  5. Step 5: Solve for x
    x = 19,179,169,832.37/153,920
  6. Step 6: Final answer
    x = 124,604.79

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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.