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Finding the Fourth Proportional to 191,347.20, 287,020.80 and 121,305.60

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Solution

The fourth proportional to 191,347.20, 287,020.80 and 121,305.60 is: 181,958.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,347.20 : 287,020.80 = 121,305.60 : x
  2. Step 2: Convert to fraction form
    191,347.20/287,020.80 = 121,305.60/x
  3. Step 3: Cross multiply
    191,347.20x = 287,020.80 × 121,305.60
  4. Step 4: Simplify right side
    191,347.20x = 34,817,230,356.48
  5. Step 5: Solve for x
    x = 34,817,230,356.48/191,347.20
  6. Step 6: Final answer
    x = 181,958.40

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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.