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Finding the Fourth Proportional to 212,703.72, 319,085.82 and 72,485.16

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Solution

The fourth proportional to 212,703.72, 319,085.82 and 72,485.16 is: 108,738.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,703.72 : 319,085.82 = 72,485.16 : x
  2. Step 2: Convert to fraction form
    212,703.72/319,085.82 = 72,485.16/x
  3. Step 3: Cross multiply
    212,703.72x = 319,085.82 × 72,485.16
  4. Step 4: Simplify right side
    212,703.72x = 23,128,986,716.43
  5. Step 5: Solve for x
    x = 23,128,986,716.43/212,703.72
  6. Step 6: Final answer
    x = 108,738.05

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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.