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Finding the Fourth Proportional to 70,492.88, 105,778.20 and 39,311.12

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Solution

The fourth proportional to 70,492.88, 105,778.20 and 39,311.12 is: 58,988.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,492.88 : 105,778.20 = 39,311.12 : x
  2. Step 2: Convert to fraction form
    70,492.88/105,778.20 = 39,311.12/x
  3. Step 3: Cross multiply
    70,492.88x = 105,778.20 × 39,311.12
  4. Step 4: Simplify right side
    70,492.88x = 4,158,259,513.58
  5. Step 5: Solve for x
    x = 4,158,259,513.58/70,492.88
  6. Step 6: Final answer
    x = 58,988.36

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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.