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Finding the Fourth Proportional to 108,705.60, 163,058.40 and 91,209.60

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Solution

The fourth proportional to 108,705.60, 163,058.40 and 91,209.60 is: 136,814.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,705.60 : 163,058.40 = 91,209.60 : x
  2. Step 2: Convert to fraction form
    108,705.60/163,058.40 = 91,209.60/x
  3. Step 3: Cross multiply
    108,705.60x = 163,058.40 × 91,209.60
  4. Step 4: Simplify right side
    108,705.60x = 14,872,491,440.64
  5. Step 5: Solve for x
    x = 14,872,491,440.64/108,705.60
  6. Step 6: Final answer
    x = 136,814.40

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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.