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Finding the Fourth Proportional to 191,973.20, 287,959.80 and 128,987.60

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Solution

The fourth proportional to 191,973.20, 287,959.80 and 128,987.60 is: 193,481.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,973.20 : 287,959.80 = 128,987.60 : x
  2. Step 2: Convert to fraction form
    191,973.20/287,959.80 = 128,987.60/x
  3. Step 3: Cross multiply
    191,973.20x = 287,959.80 × 128,987.60
  4. Step 4: Simplify right side
    191,973.20x = 37,143,243,498.48
  5. Step 5: Solve for x
    x = 37,143,243,498.48/191,973.20
  6. Step 6: Final answer
    x = 193,481.40

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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.