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Finding the Fourth Proportional to 128,903.60, 193,355.40 and 69,854.60

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Solution

The fourth proportional to 128,903.60, 193,355.40 and 69,854.60 is: 104,781.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,903.60 : 193,355.40 = 69,854.60 : x
  2. Step 2: Convert to fraction form
    128,903.60/193,355.40 = 69,854.60/x
  3. Step 3: Cross multiply
    128,903.60x = 193,355.40 × 69,854.60
  4. Step 4: Simplify right side
    128,903.60x = 13,506,764,124.84
  5. Step 5: Solve for x
    x = 13,506,764,124.84/128,903.60
  6. Step 6: Final answer
    x = 104,781.90

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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.