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Finding the Fourth Proportional to 351,918.48, 527,878.76 and 85,678.96

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Solution

The fourth proportional to 351,918.48, 527,878.76 and 85,678.96 is: 128,518.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,918.48 : 527,878.76 = 85,678.96 : x
  2. Step 2: Convert to fraction form
    351,918.48/527,878.76 = 85,678.96/x
  3. Step 3: Cross multiply
    351,918.48x = 527,878.76 × 85,678.96
  4. Step 4: Simplify right side
    351,918.48x = 45,228,103,162.89
  5. Step 5: Solve for x
    x = 45,228,103,162.89/351,918.48
  6. Step 6: Final answer
    x = 128,518.69

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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.