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Finding the Fourth Proportional to 191,660.67, 287,110.71 and 90,319.95

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Solution

The fourth proportional to 191,660.67, 287,110.71 and 90,319.95 is: 135,300.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,660.67 : 287,110.71 = 90,319.95 : x
  2. Step 2: Convert to fraction form
    191,660.67/287,110.71 = 90,319.95/x
  3. Step 3: Cross multiply
    191,660.67x = 287,110.71 × 90,319.95
  4. Step 4: Simplify right side
    191,660.67x = 25,931,824,971.66
  5. Step 5: Solve for x
    x = 25,931,824,971.66/191,660.67
  6. Step 6: Final answer
    x = 135,300.71

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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.