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Finding the Fourth Proportional to 172,485.84, 258,728.76 and 78,713.04

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Solution

The fourth proportional to 172,485.84, 258,728.76 and 78,713.04 is: 118,069.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,485.84 : 258,728.76 = 78,713.04 : x
  2. Step 2: Convert to fraction form
    172,485.84/258,728.76 = 78,713.04/x
  3. Step 3: Cross multiply
    172,485.84x = 258,728.76 × 78,713.04
  4. Step 4: Simplify right side
    172,485.84x = 20,365,327,235.03
  5. Step 5: Solve for x
    x = 20,365,327,235.03/172,485.84
  6. Step 6: Final answer
    x = 118,069.56

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1.5x scale

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.