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Finding the Fourth Proportional to 664,509.78, 996,862.49 and 215,081.28

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Solution

The fourth proportional to 664,509.78, 996,862.49 and 215,081.28 is: 322,653.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,509.78 : 996,862.49 = 215,081.28 : x
  2. Step 2: Convert to fraction form
    664,509.78/996,862.49 = 215,081.28/x
  3. Step 3: Cross multiply
    664,509.78x = 996,862.49 × 215,081.28
  4. Step 4: Simplify right side
    664,509.78x = 214,406,460,333.19
  5. Step 5: Solve for x
    x = 214,406,460,333.19/664,509.78
  6. Step 6: Final answer
    x = 322,653.58

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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.