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Finding the Fourth Proportional to 640,865.70, 961,215.12 and 167,587.56

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Solution

The fourth proportional to 640,865.70, 961,215.12 and 167,587.56 is: 251,359.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,865.70 : 961,215.12 = 167,587.56 : x
  2. Step 2: Convert to fraction form
    640,865.70/961,215.12 = 167,587.56/x
  3. Step 3: Cross multiply
    640,865.70x = 961,215.12 × 167,587.56
  4. Step 4: Simplify right side
    640,865.70x = 161,087,696,595.91
  5. Step 5: Solve for x
    x = 161,087,696,595.91/640,865.70
  6. Step 6: Final answer
    x = 251,359.52

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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.