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Finding the Fourth Proportional to 218,705.40, 328,058.10 and 70,961.40

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Solution

The fourth proportional to 218,705.40, 328,058.10 and 70,961.40 is: 106,442.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,705.40 : 328,058.10 = 70,961.40 : x
  2. Step 2: Convert to fraction form
    218,705.40/328,058.10 = 70,961.40/x
  3. Step 3: Cross multiply
    218,705.40x = 328,058.10 × 70,961.40
  4. Step 4: Simplify right side
    218,705.40x = 23,279,462,057.34
  5. Step 5: Solve for x
    x = 23,279,462,057.34/218,705.40
  6. Step 6: Final answer
    x = 106,442.10

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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.