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Finding the Fourth Proportional to 151,355.70, 208,870.89 and 87,730.40

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Solution

The fourth proportional to 151,355.70, 208,870.89 and 87,730.40 is: 121,067.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,355.70 : 208,870.89 = 87,730.40 : x
  2. Step 2: Convert to fraction form
    151,355.70/208,870.89 = 87,730.40/x
  3. Step 3: Cross multiply
    151,355.70x = 208,870.89 × 87,730.40
  4. Step 4: Simplify right side
    151,355.70x = 18,324,326,728.06
  5. Step 5: Solve for x
    x = 18,324,326,728.06/151,355.70
  6. Step 6: Final answer
    x = 121,067.97

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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.