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Finding the Fourth Proportional to 521,989.89, 720,311.95 and 307,088.43

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Solution

The fourth proportional to 521,989.89, 720,311.95 and 307,088.43 is: 423,761.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,989.89 : 720,311.95 = 307,088.43 : x
  2. Step 2: Convert to fraction form
    521,989.89/720,311.95 = 307,088.43/x
  3. Step 3: Cross multiply
    521,989.89x = 720,311.95 × 307,088.43
  4. Step 4: Simplify right side
    521,989.89x = 221,199,465,835.74
  5. Step 5: Solve for x
    x = 221,199,465,835.74/521,989.89
  6. Step 6: Final answer
    x = 423,761.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.