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Finding the Fourth Proportional to 191,915.20, 287,505.60 and 103,139.20

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Solution

The fourth proportional to 191,915.20, 287,505.60 and 103,139.20 is: 154,511.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,915.20 : 287,505.60 = 103,139.20 : x
  2. Step 2: Convert to fraction form
    191,915.20/287,505.60 = 103,139.20/x
  3. Step 3: Cross multiply
    191,915.20x = 287,505.60 × 103,139.20
  4. Step 4: Simplify right side
    191,915.20x = 29,653,097,579.52
  5. Step 5: Solve for x
    x = 29,653,097,579.52/191,915.20
  6. Step 6: Final answer
    x = 154,511.46

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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.