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Finding the Fourth Proportional to 390,145.56, 538,632.90 and 247,028.28

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Solution

The fourth proportional to 390,145.56, 538,632.90 and 247,028.28 is: 341,045.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,145.56 : 538,632.90 = 247,028.28 : x
  2. Step 2: Convert to fraction form
    390,145.56/538,632.90 = 247,028.28/x
  3. Step 3: Cross multiply
    390,145.56x = 538,632.90 × 247,028.28
  4. Step 4: Simplify right side
    390,145.56x = 133,057,558,838.41
  5. Step 5: Solve for x
    x = 133,057,558,838.41/390,145.56
  6. Step 6: Final answer
    x = 341,045.94

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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.