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Finding the Fourth Proportional to 386,466.40, 579,699.60 and 261,128.80

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Solution

The fourth proportional to 386,466.40, 579,699.60 and 261,128.80 is: 391,693.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,466.40 : 579,699.60 = 261,128.80 : x
  2. Step 2: Convert to fraction form
    386,466.40/579,699.60 = 261,128.80/x
  3. Step 3: Cross multiply
    386,466.40x = 579,699.60 × 261,128.80
  4. Step 4: Simplify right side
    386,466.40x = 151,376,260,908.48
  5. Step 5: Solve for x
    x = 151,376,260,908.48/386,466.40
  6. Step 6: Final answer
    x = 391,693.20

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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.