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Finding the Fourth Proportional to 686,639, 1,030,242 and 370,723.88

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Solution

The fourth proportional to 686,639, 1,030,242 and 370,723.88 is: 556,238.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,639 : 1,030,242 = 370,723.88 : x
  2. Step 2: Convert to fraction form
    686,639/1,030,242 = 370,723.88/x
  3. Step 3: Cross multiply
    686,639x = 1,030,242 × 370,723.88
  4. Step 4: Simplify right side
    686,639x = 381,935,311,578.96
  5. Step 5: Solve for x
    x = 381,935,311,578.96/686,639
  6. Step 6: Final answer
    x = 556,238.88

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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.