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Finding the Fourth Proportional to 64,701.40, 89,063.40 and 55,778.44

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Solution

The fourth proportional to 64,701.40, 89,063.40 and 55,778.44 is: 76,780.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,701.40 : 89,063.40 = 55,778.44 : x
  2. Step 2: Convert to fraction form
    64,701.40/89,063.40 = 55,778.44/x
  3. Step 3: Cross multiply
    64,701.40x = 89,063.40 × 55,778.44
  4. Step 4: Simplify right side
    64,701.40x = 4,967,817,513.10
  5. Step 5: Solve for x
    x = 4,967,817,513.10/64,701.40
  6. Step 6: Final answer
    x = 76,780.68

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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.