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Finding the Fourth Proportional to 261,485.70, 391,883.89 and 103,628.02

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Solution

The fourth proportional to 261,485.70, 391,883.89 and 103,628.02 is: 155,305.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,485.70 : 391,883.89 = 103,628.02 : x
  2. Step 2: Convert to fraction form
    261,485.70/391,883.89 = 103,628.02/x
  3. Step 3: Cross multiply
    261,485.70x = 391,883.89 × 103,628.02
  4. Step 4: Simplify right side
    261,485.70x = 40,610,151,590.60
  5. Step 5: Solve for x
    x = 40,610,151,590.60/261,485.70
  6. Step 6: Final answer
    x = 155,305.44

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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.