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Finding the Fourth Proportional to 85,329.40, 128,139.90 and 55,877.80

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Solution

The fourth proportional to 85,329.40, 128,139.90 and 55,877.80 is: 83,912.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,329.40 : 128,139.90 = 55,877.80 : x
  2. Step 2: Convert to fraction form
    85,329.40/128,139.90 = 55,877.80/x
  3. Step 3: Cross multiply
    85,329.40x = 128,139.90 × 55,877.80
  4. Step 4: Simplify right side
    85,329.40x = 7,160,175,704.22
  5. Step 5: Solve for x
    x = 7,160,175,704.22/85,329.40
  6. Step 6: Final answer
    x = 83,912.18

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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.