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Finding the Fourth Proportional to 390,381.53, 538,840.76 and 227,076.21

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Solution

The fourth proportional to 390,381.53, 538,840.76 and 227,076.21 is: 313,431.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,381.53 : 538,840.76 = 227,076.21 : x
  2. Step 2: Convert to fraction form
    390,381.53/538,840.76 = 227,076.21/x
  3. Step 3: Cross multiply
    390,381.53x = 538,840.76 × 227,076.21
  4. Step 4: Simplify right side
    390,381.53x = 122,357,916,438.94
  5. Step 5: Solve for x
    x = 122,357,916,438.94/390,381.53
  6. Step 6: Final answer
    x = 313,431.63

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1.5x scale

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.