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Finding the Fourth Proportional to 70,135.76, 105,197.88 and 20,887.76

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Solution

The fourth proportional to 70,135.76, 105,197.88 and 20,887.76 is: 31,329.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,135.76 : 105,197.88 = 20,887.76 : x
  2. Step 2: Convert to fraction form
    70,135.76/105,197.88 = 20,887.76/x
  3. Step 3: Cross multiply
    70,135.76x = 105,197.88 × 20,887.76
  4. Step 4: Simplify right side
    70,135.76x = 2,197,348,069.95
  5. Step 5: Solve for x
    x = 2,197,348,069.95/70,135.76
  6. Step 6: Final answer
    x = 31,329.92

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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.