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Finding the Fourth Proportional to 256,866.40, 385,300.14 and 138,593.44

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Solution

The fourth proportional to 256,866.40, 385,300.14 and 138,593.44 is: 207,890.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,866.40 : 385,300.14 = 138,593.44 : x
  2. Step 2: Convert to fraction form
    256,866.40/385,300.14 = 138,593.44/x
  3. Step 3: Cross multiply
    256,866.40x = 385,300.14 × 138,593.44
  4. Step 4: Simplify right side
    256,866.40x = 53,400,071,835.08
  5. Step 5: Solve for x
    x = 53,400,071,835.08/256,866.40
  6. Step 6: Final answer
    x = 207,890.45

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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.