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Finding the Fourth Proportional to 191,915.70, 287,731.38 and 91,980.78

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Solution

The fourth proportional to 191,915.70, 287,731.38 and 91,980.78 is: 137,903.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,915.70 : 287,731.38 = 91,980.78 : x
  2. Step 2: Convert to fraction form
    191,915.70/287,731.38 = 91,980.78/x
  3. Step 3: Cross multiply
    191,915.70x = 287,731.38 × 91,980.78
  4. Step 4: Simplify right side
    191,915.70x = 26,465,756,762.88
  5. Step 5: Solve for x
    x = 26,465,756,762.88/191,915.70
  6. Step 6: Final answer
    x = 137,903.03

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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.