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Finding the Fourth Proportional to 479,647.61, 661,915.13 and 261,856.63

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Solution

The fourth proportional to 479,647.61, 661,915.13 and 261,856.63 is: 361,362.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,647.61 : 661,915.13 = 261,856.63 : x
  2. Step 2: Convert to fraction form
    479,647.61/661,915.13 = 261,856.63/x
  3. Step 3: Cross multiply
    479,647.61x = 661,915.13 × 261,856.63
  4. Step 4: Simplify right side
    479,647.61x = 173,326,865,287.81
  5. Step 5: Solve for x
    x = 173,326,865,287.81/479,647.61
  6. Step 6: Final answer
    x = 361,362.93

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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.