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Finding the Fourth Proportional to 245,890.89, 368,428.70 and 85,880.86

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Solution

The fourth proportional to 245,890.89, 368,428.70 and 85,880.86 is: 128,678.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,890.89 : 368,428.70 = 85,880.86 : x
  2. Step 2: Convert to fraction form
    245,890.89/368,428.70 = 85,880.86/x
  3. Step 3: Cross multiply
    245,890.89x = 368,428.70 × 85,880.86
  4. Step 4: Simplify right side
    245,890.89x = 31,640,972,898.31
  5. Step 5: Solve for x
    x = 31,640,972,898.31/245,890.89
  6. Step 6: Final answer
    x = 128,678.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.