Home / 680,905.67-939,619.47-390,308.87

Finding the Fourth Proportional to 680,905.67, 939,619.47 and 390,308.87

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Solution

The fourth proportional to 680,905.67, 939,619.47 and 390,308.87 is: 538,608.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,905.67 : 939,619.47 = 390,308.87 : x
  2. Step 2: Convert to fraction form
    680,905.67/939,619.47 = 390,308.87/x
  3. Step 3: Cross multiply
    680,905.67x = 939,619.47 × 390,308.87
  4. Step 4: Simplify right side
    680,905.67x = 366,741,809,948.39
  5. Step 5: Solve for x
    x = 366,741,809,948.39/680,905.67
  6. Step 6: Final answer
    x = 538,608.83

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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.