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Finding the Fourth Proportional to 305,689.05, 421,901.10 and 178,364.34

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Solution

The fourth proportional to 305,689.05, 421,901.10 and 178,364.34 is: 246,172.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,689.05 : 421,901.10 = 178,364.34 : x
  2. Step 2: Convert to fraction form
    305,689.05/421,901.10 = 178,364.34/x
  3. Step 3: Cross multiply
    305,689.05x = 421,901.10 × 178,364.34
  4. Step 4: Simplify right side
    305,689.05x = 75,252,111,246.77
  5. Step 5: Solve for x
    x = 75,252,111,246.77/305,689.05
  6. Step 6: Final answer
    x = 246,172.09

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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.