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Finding the Fourth Proportional to 645,125.80, 966,813.90 and 431,285.80

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Solution

The fourth proportional to 645,125.80, 966,813.90 and 431,285.80 is: 646,343.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,125.80 : 966,813.90 = 431,285.80 : x
  2. Step 2: Convert to fraction form
    645,125.80/966,813.90 = 431,285.80/x
  3. Step 3: Cross multiply
    645,125.80x = 966,813.90 × 431,285.80
  4. Step 4: Simplify right side
    645,125.80x = 416,973,106,312.62
  5. Step 5: Solve for x
    x = 416,973,106,312.62/645,125.80
  6. Step 6: Final answer
    x = 646,343.87

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1.5x scale

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.