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Finding the Fourth Proportional to 74,690.70, 112,069 and 39,621.76

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Solution

The fourth proportional to 74,690.70, 112,069 and 39,621.76 is: 59,450.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,690.70 : 112,069 = 39,621.76 : x
  2. Step 2: Convert to fraction form
    74,690.70/112,069 = 39,621.76/x
  3. Step 3: Cross multiply
    74,690.70x = 112,069 × 39,621.76
  4. Step 4: Simplify right side
    74,690.70x = 4,440,371,021.44
  5. Step 5: Solve for x
    x = 4,440,371,021.44/74,690.70
  6. Step 6: Final answer
    x = 59,450.12

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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.