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Finding the Fourth Proportional to 85,145.40, 127,731.60 and 28,990.80

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Solution

The fourth proportional to 85,145.40, 127,731.60 and 28,990.80 is: 43,490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,145.40 : 127,731.60 = 28,990.80 : x
  2. Step 2: Convert to fraction form
    85,145.40/127,731.60 = 28,990.80/x
  3. Step 3: Cross multiply
    85,145.40x = 127,731.60 × 28,990.80
  4. Step 4: Simplify right side
    85,145.40x = 3,703,041,269.28
  5. Step 5: Solve for x
    x = 3,703,041,269.28/85,145.40
  6. Step 6: Final answer
    x = 43,490.80

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1.5x scale

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.