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Finding the Fourth Proportional to 388,418.64, 536,027.64 and 218,658.72

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Solution

The fourth proportional to 388,418.64, 536,027.64 and 218,658.72 is: 301,754.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,418.64 : 536,027.64 = 218,658.72 : x
  2. Step 2: Convert to fraction form
    388,418.64/536,027.64 = 218,658.72/x
  3. Step 3: Cross multiply
    388,418.64x = 536,027.64 × 218,658.72
  4. Step 4: Simplify right side
    388,418.64x = 117,207,117,647.02
  5. Step 5: Solve for x
    x = 117,207,117,647.02/388,418.64
  6. Step 6: Final answer
    x = 301,754.62

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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.