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Finding the Fourth Proportional to 191,580, 287,502.03 and 66,921

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Solution

The fourth proportional to 191,580, 287,502.03 and 66,921 is: 100,427.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,580 : 287,502.03 = 66,921 : x
  2. Step 2: Convert to fraction form
    191,580/287,502.03 = 66,921/x
  3. Step 3: Cross multiply
    191,580x = 287,502.03 × 66,921
  4. Step 4: Simplify right side
    191,580x = 19,239,923,349.63
  5. Step 5: Solve for x
    x = 19,239,923,349.63/191,580
  6. Step 6: Final answer
    x = 100,427.62

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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.