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Finding the Fourth Proportional to 657,128.72, 906,837 and 355,322

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Solution

The fourth proportional to 657,128.72, 906,837 and 355,322 is: 490,344.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,128.72 : 906,837 = 355,322 : x
  2. Step 2: Convert to fraction form
    657,128.72/906,837 = 355,322/x
  3. Step 3: Cross multiply
    657,128.72x = 906,837 × 355,322
  4. Step 4: Simplify right side
    657,128.72x = 322,219,136,514
  5. Step 5: Solve for x
    x = 322,219,136,514/657,128.72
  6. Step 6: Final answer
    x = 490,344.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.