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Finding the Fourth Proportional to 390,353.46, 538,676.19 and 218,260.86

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Solution

The fourth proportional to 390,353.46, 538,676.19 and 218,260.86 is: 301,193.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,353.46 : 538,676.19 = 218,260.86 : x
  2. Step 2: Convert to fraction form
    390,353.46/538,676.19 = 218,260.86/x
  3. Step 3: Cross multiply
    390,353.46x = 538,676.19 × 218,260.86
  4. Step 4: Simplify right side
    390,353.46x = 117,571,928,490.92
  5. Step 5: Solve for x
    x = 117,571,928,490.92/390,353.46
  6. Step 6: Final answer
    x = 301,193.51

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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.