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Finding the Fourth Proportional to 406,221.60, 561,655.92 and 355,776

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Solution

The fourth proportional to 406,221.60, 561,655.92 and 355,776 is: 491,908.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    406,221.60 : 561,655.92 = 355,776 : x
  2. Step 2: Convert to fraction form
    406,221.60/561,655.92 = 355,776/x
  3. Step 3: Cross multiply
    406,221.60x = 561,655.92 × 355,776
  4. Step 4: Simplify right side
    406,221.60x = 199,823,696,593.92
  5. Step 5: Solve for x
    x = 199,823,696,593.92/406,221.60
  6. Step 6: Final answer
    x = 491,908.10

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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.