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Finding the Fourth Proportional to 388,191.78, 535,699.17 and 218,425.50

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Solution

The fourth proportional to 388,191.78, 535,699.17 and 218,425.50 is: 301,424.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,191.78 : 535,699.17 = 218,425.50 : x
  2. Step 2: Convert to fraction form
    388,191.78/535,699.17 = 218,425.50/x
  3. Step 3: Cross multiply
    388,191.78x = 535,699.17 × 218,425.50
  4. Step 4: Simplify right side
    388,191.78x = 117,010,359,056.84
  5. Step 5: Solve for x
    x = 117,010,359,056.84/388,191.78
  6. Step 6: Final answer
    x = 301,424.10

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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.