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Finding the Fourth Proportional to 93,249.72, 128,704.50 and 61,421.40

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Solution

The fourth proportional to 93,249.72, 128,704.50 and 61,421.40 is: 84,774.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,249.72 : 128,704.50 = 61,421.40 : x
  2. Step 2: Convert to fraction form
    93,249.72/128,704.50 = 61,421.40/x
  3. Step 3: Cross multiply
    93,249.72x = 128,704.50 × 61,421.40
  4. Step 4: Simplify right side
    93,249.72x = 7,905,210,576.30
  5. Step 5: Solve for x
    x = 7,905,210,576.30/93,249.72
  6. Step 6: Final answer
    x = 84,774.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.