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Finding the Fourth Proportional to 386,389.48, 579,471.90 and 149,679.40

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Solution

The fourth proportional to 386,389.48, 579,471.90 and 149,679.40 is: 224,475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,389.48 : 579,471.90 = 149,679.40 : x
  2. Step 2: Convert to fraction form
    386,389.48/579,471.90 = 149,679.40/x
  3. Step 3: Cross multiply
    386,389.48x = 579,471.90 × 149,679.40
  4. Step 4: Simplify right side
    386,389.48x = 86,735,006,308.86
  5. Step 5: Solve for x
    x = 86,735,006,308.86/386,389.48
  6. Step 6: Final answer
    x = 224,475.59

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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.