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Finding the Fourth Proportional to 665,013.74, 997,660.90 and 215,699.72

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Solution

The fourth proportional to 665,013.74, 997,660.90 and 215,699.72 is: 323,595.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,013.74 : 997,660.90 = 215,699.72 : x
  2. Step 2: Convert to fraction form
    665,013.74/997,660.90 = 215,699.72/x
  3. Step 3: Cross multiply
    665,013.74x = 997,660.90 × 215,699.72
  4. Step 4: Simplify right side
    665,013.74x = 215,195,172,066.27
  5. Step 5: Solve for x
    x = 215,195,172,066.27/665,013.74
  6. Step 6: Final answer
    x = 323,595.08

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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.