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Finding the Fourth Proportional to 420,989.88, 580,971.18 and 230,005.56

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Solution

The fourth proportional to 420,989.88, 580,971.18 and 230,005.56 is: 317,410.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,989.88 : 580,971.18 = 230,005.56 : x
  2. Step 2: Convert to fraction form
    420,989.88/580,971.18 = 230,005.56/x
  3. Step 3: Cross multiply
    420,989.88x = 580,971.18 × 230,005.56
  4. Step 4: Simplify right side
    420,989.88x = 133,626,601,599.76
  5. Step 5: Solve for x
    x = 133,626,601,599.76/420,989.88
  6. Step 6: Final answer
    x = 317,410.48

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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.