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Finding the Fourth Proportional to 74,509.67, 102,724.61 and 61,715.72

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Solution

The fourth proportional to 74,509.67, 102,724.61 and 61,715.72 is: 85,085.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,509.67 : 102,724.61 = 61,715.72 : x
  2. Step 2: Convert to fraction form
    74,509.67/102,724.61 = 61,715.72/x
  3. Step 3: Cross multiply
    74,509.67x = 102,724.61 × 61,715.72
  4. Step 4: Simplify right side
    74,509.67x = 6,339,723,216.10
  5. Step 5: Solve for x
    x = 6,339,723,216.10/74,509.67
  6. Step 6: Final answer
    x = 85,085.91

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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.