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Finding the Fourth Proportional to 85,070.52, 117,200.79 and 61,155.81

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Solution

The fourth proportional to 85,070.52, 117,200.79 and 61,155.81 is: 84,253.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,070.52 : 117,200.79 = 61,155.81 : x
  2. Step 2: Convert to fraction form
    85,070.52/117,200.79 = 61,155.81/x
  3. Step 3: Cross multiply
    85,070.52x = 117,200.79 × 61,155.81
  4. Step 4: Simplify right side
    85,070.52x = 7,167,509,245.09
  5. Step 5: Solve for x
    x = 7,167,509,245.09/85,070.52
  6. Step 6: Final answer
    x = 84,253.74

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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.