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Finding the Fourth Proportional to 310,603.70, 428,367.53 and 213,961.79

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Solution

The fourth proportional to 310,603.70, 428,367.53 and 213,961.79 is: 295,084.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,603.70 : 428,367.53 = 213,961.79 : x
  2. Step 2: Convert to fraction form
    310,603.70/428,367.53 = 213,961.79/x
  3. Step 3: Cross multiply
    310,603.70x = 428,367.53 × 213,961.79
  4. Step 4: Simplify right side
    310,603.70x = 91,654,280,285.03
  5. Step 5: Solve for x
    x = 91,654,280,285.03/310,603.70
  6. Step 6: Final answer
    x = 295,084.32

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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.