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Finding the Fourth Proportional to 85,515.40, 128,273.10 and 35,578.90

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Solution

The fourth proportional to 85,515.40, 128,273.10 and 35,578.90 is: 53,368.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,515.40 : 128,273.10 = 35,578.90 : x
  2. Step 2: Convert to fraction form
    85,515.40/128,273.10 = 35,578.90/x
  3. Step 3: Cross multiply
    85,515.40x = 128,273.10 × 35,578.90
  4. Step 4: Simplify right side
    85,515.40x = 4,563,815,797.59
  5. Step 5: Solve for x
    x = 4,563,815,797.59/85,515.40
  6. Step 6: Final answer
    x = 53,368.35

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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.