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Finding the Fourth Proportional to 647,565.80, 971,348.70 and 643,418.60

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Solution

The fourth proportional to 647,565.80, 971,348.70 and 643,418.60 is: 965,127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,565.80 : 971,348.70 = 643,418.60 : x
  2. Step 2: Convert to fraction form
    647,565.80/971,348.70 = 643,418.60/x
  3. Step 3: Cross multiply
    647,565.80x = 971,348.70 × 643,418.60
  4. Step 4: Simplify right side
    647,565.80x = 624,983,820,665.82
  5. Step 5: Solve for x
    x = 624,983,820,665.82/647,565.80
  6. Step 6: Final answer
    x = 965,127.90

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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.