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Finding the Fourth Proportional to 654,865.80, 980,330.40 and 388,489.20

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Solution

The fourth proportional to 654,865.80, 980,330.40 and 388,489.20 is: 581,566.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,865.80 : 980,330.40 = 388,489.20 : x
  2. Step 2: Convert to fraction form
    654,865.80/980,330.40 = 388,489.20/x
  3. Step 3: Cross multiply
    654,865.80x = 980,330.40 × 388,489.20
  4. Step 4: Simplify right side
    654,865.80x = 380,847,772,831.68
  5. Step 5: Solve for x
    x = 380,847,772,831.68/654,865.80
  6. Step 6: Final answer
    x = 581,566.14

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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.