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Finding the Fourth Proportional to 388,401.09, 535,921.97 and 218,599.17

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Solution

The fourth proportional to 388,401.09, 535,921.97 and 218,599.17 is: 301,626.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,401.09 : 535,921.97 = 218,599.17 : x
  2. Step 2: Convert to fraction form
    388,401.09/535,921.97 = 218,599.17/x
  3. Step 3: Cross multiply
    388,401.09x = 535,921.97 × 218,599.17
  4. Step 4: Simplify right side
    388,401.09x = 117,152,096,733.77
  5. Step 5: Solve for x
    x = 117,152,096,733.77/388,401.09
  6. Step 6: Final answer
    x = 301,626.59

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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.