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Finding the Fourth Proportional to 390,362.58, 538,701.34 and 218,286.79

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Solution

The fourth proportional to 390,362.58, 538,701.34 and 218,286.79 is: 301,236.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,362.58 : 538,701.34 = 218,286.79 : x
  2. Step 2: Convert to fraction form
    390,362.58/538,701.34 = 218,286.79/x
  3. Step 3: Cross multiply
    390,362.58x = 538,701.34 × 218,286.79
  4. Step 4: Simplify right side
    390,362.58x = 117,591,386,277.30
  5. Step 5: Solve for x
    x = 117,591,386,277.30/390,362.58
  6. Step 6: Final answer
    x = 301,236.32

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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.