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Finding the Fourth Proportional to 528,139.80, 792,442.98 and 213,211.80

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Solution

The fourth proportional to 528,139.80, 792,442.98 and 213,211.80 is: 319,911.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,139.80 : 792,442.98 = 213,211.80 : x
  2. Step 2: Convert to fraction form
    528,139.80/792,442.98 = 213,211.80/x
  3. Step 3: Cross multiply
    528,139.80x = 792,442.98 × 213,211.80
  4. Step 4: Simplify right side
    528,139.80x = 168,958,194,163.16
  5. Step 5: Solve for x
    x = 168,958,194,163.16/528,139.80
  6. Step 6: Final answer
    x = 319,911.88

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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.