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Finding the Fourth Proportional to 639,434.70, 959,670.45 and 618,698.70

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Solution

The fourth proportional to 639,434.70, 959,670.45 and 618,698.70 is: 928,549.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,434.70 : 959,670.45 = 618,698.70 : x
  2. Step 2: Convert to fraction form
    639,434.70/959,670.45 = 618,698.70/x
  3. Step 3: Cross multiply
    639,434.70x = 959,670.45 × 618,698.70
  4. Step 4: Simplify right side
    639,434.70x = 593,746,859,843.42
  5. Step 5: Solve for x
    x = 593,746,859,843.42/639,434.70
  6. Step 6: Final answer
    x = 928,549.64

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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.