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Finding the Fourth Proportional to 425,701.80, 638,639.10 and 145,247.40

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Solution

The fourth proportional to 425,701.80, 638,639.10 and 145,247.40 is: 217,900.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,701.80 : 638,639.10 = 145,247.40 : x
  2. Step 2: Convert to fraction form
    425,701.80/638,639.10 = 145,247.40/x
  3. Step 3: Cross multiply
    425,701.80x = 638,639.10 × 145,247.40
  4. Step 4: Simplify right side
    425,701.80x = 92,760,668,813.34
  5. Step 5: Solve for x
    x = 92,760,668,813.34/425,701.80
  6. Step 6: Final answer
    x = 217,900.58

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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.