Home / 390,296.63-538,610.24-218,220.72

Finding the Fourth Proportional to 390,296.63, 538,610.24 and 218,220.72

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Solution

The fourth proportional to 390,296.63, 538,610.24 and 218,220.72 is: 301,145.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,296.63 : 538,610.24 = 218,220.72 : x
  2. Step 2: Convert to fraction form
    390,296.63/538,610.24 = 218,220.72/x
  3. Step 3: Cross multiply
    390,296.63x = 538,610.24 × 218,220.72
  4. Step 4: Simplify right side
    390,296.63x = 117,535,914,917.73
  5. Step 5: Solve for x
    x = 117,535,914,917.73/390,296.63
  6. Step 6: Final answer
    x = 301,145.10

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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.