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Finding the Fourth Proportional to 191,720.40, 287,364.60 and 91,928.40

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Solution

The fourth proportional to 191,720.40, 287,364.60 and 91,928.40 is: 137,789.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,720.40 : 287,364.60 = 91,928.40 : x
  2. Step 2: Convert to fraction form
    191,720.40/287,364.60 = 91,928.40/x
  3. Step 3: Cross multiply
    191,720.40x = 287,364.60 × 91,928.40
  4. Step 4: Simplify right side
    191,720.40x = 26,416,967,894.64
  5. Step 5: Solve for x
    x = 26,416,967,894.64/191,720.40
  6. Step 6: Final answer
    x = 137,789.03

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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.