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Finding the Fourth Proportional to 108,987.20, 163,480.80 and 91,361.60

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Solution

The fourth proportional to 108,987.20, 163,480.80 and 91,361.60 is: 137,042.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,987.20 : 163,480.80 = 91,361.60 : x
  2. Step 2: Convert to fraction form
    108,987.20/163,480.80 = 91,361.60/x
  3. Step 3: Cross multiply
    108,987.20x = 163,480.80 × 91,361.60
  4. Step 4: Simplify right side
    108,987.20x = 14,935,867,457.28
  5. Step 5: Solve for x
    x = 14,935,867,457.28/108,987.20
  6. Step 6: Final answer
    x = 137,042.40

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1.5x scale

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.