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Finding the Fourth Proportional to 665,722.80, 998,584.20 and 328,815.45

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Solution

The fourth proportional to 665,722.80, 998,584.20 and 328,815.45 is: 493,223.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,722.80 : 998,584.20 = 328,815.45 : x
  2. Step 2: Convert to fraction form
    665,722.80/998,584.20 = 328,815.45/x
  3. Step 3: Cross multiply
    665,722.80x = 998,584.20 × 328,815.45
  4. Step 4: Simplify right side
    665,722.80x = 328,349,913,085.89
  5. Step 5: Solve for x
    x = 328,349,913,085.89/665,722.80
  6. Step 6: Final answer
    x = 493,223.18

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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.