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Finding the Fourth Proportional to 92,879.76, 128,240.64 and 57,117.72

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Solution

The fourth proportional to 92,879.76, 128,240.64 and 57,117.72 is: 78,863.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,879.76 : 128,240.64 = 57,117.72 : x
  2. Step 2: Convert to fraction form
    92,879.76/128,240.64 = 57,117.72/x
  3. Step 3: Cross multiply
    92,879.76x = 128,240.64 × 57,117.72
  4. Step 4: Simplify right side
    92,879.76x = 7,324,812,968.14
  5. Step 5: Solve for x
    x = 7,324,812,968.14/92,879.76
  6. Step 6: Final answer
    x = 78,863.39

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1.5x scale

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.