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Finding the Fourth Proportional to 128,150.40, 191,970.88 and 100,318.08

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Solution

The fourth proportional to 128,150.40, 191,970.88 and 100,318.08 is: 150,277.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,150.40 : 191,970.88 = 100,318.08 : x
  2. Step 2: Convert to fraction form
    128,150.40/191,970.88 = 100,318.08/x
  3. Step 3: Cross multiply
    128,150.40x = 191,970.88 × 100,318.08
  4. Step 4: Simplify right side
    128,150.40x = 19,258,150,097.51
  5. Step 5: Solve for x
    x = 19,258,150,097.51/128,150.40
  6. Step 6: Final answer
    x = 150,277.72

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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.