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Finding the Fourth Proportional to 108,509.65, 149,690.50 and 70,258.21

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Solution

The fourth proportional to 108,509.65, 149,690.50 and 70,258.21 is: 96,922.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,509.65 : 149,690.50 = 70,258.21 : x
  2. Step 2: Convert to fraction form
    108,509.65/149,690.50 = 70,258.21/x
  3. Step 3: Cross multiply
    108,509.65x = 149,690.50 × 70,258.21
  4. Step 4: Simplify right side
    108,509.65x = 10,516,986,584.01
  5. Step 5: Solve for x
    x = 10,516,986,584.01/108,509.65
  6. Step 6: Final answer
    x = 96,922.13

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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.