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Finding the Fourth Proportional to 128,705.80, 193,058.70 and 109,071.40

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Solution

The fourth proportional to 128,705.80, 193,058.70 and 109,071.40 is: 163,607.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,705.80 : 193,058.70 = 109,071.40 : x
  2. Step 2: Convert to fraction form
    128,705.80/193,058.70 = 109,071.40/x
  3. Step 3: Cross multiply
    128,705.80x = 193,058.70 × 109,071.40
  4. Step 4: Simplify right side
    128,705.80x = 21,057,182,691.18
  5. Step 5: Solve for x
    x = 21,057,182,691.18/128,705.80
  6. Step 6: Final answer
    x = 163,607.10

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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.