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Finding the Fourth Proportional to 108,509.80, 149,742.18 and 66,068.20

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Solution

The fourth proportional to 108,509.80, 149,742.18 and 66,068.20 is: 91,173.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,509.80 : 149,742.18 = 66,068.20 : x
  2. Step 2: Convert to fraction form
    108,509.80/149,742.18 = 66,068.20/x
  3. Step 3: Cross multiply
    108,509.80x = 149,742.18 × 66,068.20
  4. Step 4: Simplify right side
    108,509.80x = 9,893,196,296.68
  5. Step 5: Solve for x
    x = 9,893,196,296.68/108,509.80
  6. Step 6: Final answer
    x = 91,173.30

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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.