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Finding the Fourth Proportional to 312,309.79, 430,990.95 and 169,072.90

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Solution

The fourth proportional to 312,309.79, 430,990.95 and 169,072.90 is: 233,322.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,309.79 : 430,990.95 = 169,072.90 : x
  2. Step 2: Convert to fraction form
    312,309.79/430,990.95 = 169,072.90/x
  3. Step 3: Cross multiply
    312,309.79x = 430,990.95 × 169,072.90
  4. Step 4: Simplify right side
    312,309.79x = 72,868,889,790.26
  5. Step 5: Solve for x
    x = 72,868,889,790.26/312,309.79
  6. Step 6: Final answer
    x = 233,322.46

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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.