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Finding the Fourth Proportional to 312,647.70, 431,455.35 and 169,407.72

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Solution

The fourth proportional to 312,647.70, 431,455.35 and 169,407.72 is: 233,783.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,647.70 : 431,455.35 = 169,407.72 : x
  2. Step 2: Convert to fraction form
    312,647.70/431,455.35 = 169,407.72/x
  3. Step 3: Cross multiply
    312,647.70x = 431,455.35 × 169,407.72
  4. Step 4: Simplify right side
    312,647.70x = 73,091,867,125.30
  5. Step 5: Solve for x
    x = 73,091,867,125.30/312,647.70
  6. Step 6: Final answer
    x = 233,783.48

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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.