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Finding the Fourth Proportional to 680,816.29, 939,496.17 and 390,219.54

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Solution

The fourth proportional to 680,816.29, 939,496.17 and 390,219.54 is: 538,485.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,816.29 : 939,496.17 = 390,219.54 : x
  2. Step 2: Convert to fraction form
    680,816.29/939,496.17 = 390,219.54/x
  3. Step 3: Cross multiply
    680,816.29x = 939,496.17 × 390,219.54
  4. Step 4: Simplify right side
    680,816.29x = 366,609,760,355.56
  5. Step 5: Solve for x
    x = 366,609,760,355.56/680,816.29
  6. Step 6: Final answer
    x = 538,485.59

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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.