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Finding the Fourth Proportional to 70,742.99, 105,989.93 and 66,528.83

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Solution

The fourth proportional to 70,742.99, 105,989.93 and 66,528.83 is: 99,676.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,742.99 : 105,989.93 = 66,528.83 : x
  2. Step 2: Convert to fraction form
    70,742.99/105,989.93 = 66,528.83/x
  3. Step 3: Cross multiply
    70,742.99x = 105,989.93 × 66,528.83
  4. Step 4: Simplify right side
    70,742.99x = 7,051,385,967.01
  5. Step 5: Solve for x
    x = 7,051,385,967.01/70,742.99
  6. Step 6: Final answer
    x = 99,676.11

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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.