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Finding the Fourth Proportional to 85,920.59, 128,839.98 and 35,311.70

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Solution

The fourth proportional to 85,920.59, 128,839.98 and 35,311.70 is: 52,950.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.59 : 128,839.98 = 35,311.70 : x
  2. Step 2: Convert to fraction form
    85,920.59/128,839.98 = 35,311.70/x
  3. Step 3: Cross multiply
    85,920.59x = 128,839.98 × 35,311.70
  4. Step 4: Simplify right side
    85,920.59x = 4,549,559,219.23
  5. Step 5: Solve for x
    x = 4,549,559,219.23/85,920.59
  6. Step 6: Final answer
    x = 52,950.75

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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.