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Finding the Fourth Proportional to 390,388.53, 538,676.60 and 220,560.69

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Solution

The fourth proportional to 390,388.53, 538,676.60 and 220,560.69 is: 304,340.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,388.53 : 538,676.60 = 220,560.69 : x
  2. Step 2: Convert to fraction form
    390,388.53/538,676.60 = 220,560.69/x
  3. Step 3: Cross multiply
    390,388.53x = 538,676.60 × 220,560.69
  4. Step 4: Simplify right side
    390,388.53x = 118,810,881,480.05
  5. Step 5: Solve for x
    x = 118,810,881,480.05/390,388.53
  6. Step 6: Final answer
    x = 304,340.09

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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.