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Finding the Fourth Proportional to 388,345.47, 535,640.70 and 259,218.84

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Solution

The fourth proportional to 388,345.47, 535,640.70 and 259,218.84 is: 357,537.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,345.47 : 535,640.70 = 259,218.84 : x
  2. Step 2: Convert to fraction form
    388,345.47/535,640.70 = 259,218.84/x
  3. Step 3: Cross multiply
    388,345.47x = 535,640.70 × 259,218.84
  4. Step 4: Simplify right side
    388,345.47x = 138,848,160,910.79
  5. Step 5: Solve for x
    x = 138,848,160,910.79/388,345.47
  6. Step 6: Final answer
    x = 357,537.74

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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.