Home / 638,139.20-955,365.60-389,307.20

Finding the Fourth Proportional to 638,139.20, 955,365.60 and 389,307.20

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Solution

The fourth proportional to 638,139.20, 955,365.60 and 389,307.20 is: 582,836.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.20 : 955,365.60 = 389,307.20 : x
  2. Step 2: Convert to fraction form
    638,139.20/955,365.60 = 389,307.20/x
  3. Step 3: Cross multiply
    638,139.20x = 955,365.60 × 389,307.20
  4. Step 4: Simplify right side
    638,139.20x = 371,930,706,712.32
  5. Step 5: Solve for x
    x = 371,930,706,712.32/638,139.20
  6. Step 6: Final answer
    x = 582,836.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.