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Finding the Fourth Proportional to 660,072.20, 988,358.70 and 520,104.20

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Solution

The fourth proportional to 660,072.20, 988,358.70 and 520,104.20 is: 778,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,072.20 : 988,358.70 = 520,104.20 : x
  2. Step 2: Convert to fraction form
    660,072.20/988,358.70 = 520,104.20/x
  3. Step 3: Cross multiply
    660,072.20x = 988,358.70 × 520,104.20
  4. Step 4: Simplify right side
    660,072.20x = 514,049,510,976.54
  5. Step 5: Solve for x
    x = 514,049,510,976.54/660,072.20
  6. Step 6: Final answer
    x = 778,777.70

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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.