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Finding the Fourth Proportional to 667,711.40, 999,723.90 and 520,255.40

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Solution

The fourth proportional to 667,711.40, 999,723.90 and 520,255.40 is: 778,946.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,711.40 : 999,723.90 = 520,255.40 : x
  2. Step 2: Convert to fraction form
    667,711.40/999,723.90 = 520,255.40/x
  3. Step 3: Cross multiply
    667,711.40x = 999,723.90 × 520,255.40
  4. Step 4: Simplify right side
    667,711.40x = 520,111,757,484.06
  5. Step 5: Solve for x
    x = 520,111,757,484.06/667,711.40
  6. Step 6: Final answer
    x = 778,946.95

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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.