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Finding the Fourth Proportional to 92,991.90, 128,189.35 and 72,813.75

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Solution

The fourth proportional to 92,991.90, 128,189.35 and 72,813.75 is: 100,373.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,991.90 : 128,189.35 = 72,813.75 : x
  2. Step 2: Convert to fraction form
    92,991.90/128,189.35 = 72,813.75/x
  3. Step 3: Cross multiply
    92,991.90x = 128,189.35 × 72,813.75
  4. Step 4: Simplify right side
    92,991.90x = 9,333,947,614.93
  5. Step 5: Solve for x
    x = 9,333,947,614.93/92,991.90
  6. Step 6: Final answer
    x = 100,373.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.