Home / 659,120.36-909,265.38-390,658.28

Finding the Fourth Proportional to 659,120.36, 909,265.38 and 390,658.28

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Solution

The fourth proportional to 659,120.36, 909,265.38 and 390,658.28 is: 538,918.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,120.36 : 909,265.38 = 390,658.28 : x
  2. Step 2: Convert to fraction form
    659,120.36/909,265.38 = 390,658.28/x
  3. Step 3: Cross multiply
    659,120.36x = 909,265.38 × 390,658.28
  4. Step 4: Simplify right side
    659,120.36x = 355,212,049,414.35
  5. Step 5: Solve for x
    x = 355,212,049,414.35/659,120.36
  6. Step 6: Final answer
    x = 538,918.34

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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.