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Finding the Fourth Proportional to 388,158.60, 535,620.78 and 218,389.08

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Solution

The fourth proportional to 388,158.60, 535,620.78 and 218,389.08 is: 301,355.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,158.60 : 535,620.78 = 218,389.08 : x
  2. Step 2: Convert to fraction form
    388,158.60/535,620.78 = 218,389.08/x
  3. Step 3: Cross multiply
    388,158.60x = 535,620.78 × 218,389.08
  4. Step 4: Simplify right side
    388,158.60x = 116,973,729,373.08
  5. Step 5: Solve for x
    x = 116,973,729,373.08/388,158.60
  6. Step 6: Final answer
    x = 301,355.50

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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.