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Finding the Fourth Proportional to 661,697.28, 913,092.48 and 389,788.80

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Solution

The fourth proportional to 661,697.28, 913,092.48 and 389,788.80 is: 537,879.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,697.28 : 913,092.48 = 389,788.80 : x
  2. Step 2: Convert to fraction form
    661,697.28/913,092.48 = 389,788.80/x
  3. Step 3: Cross multiply
    661,697.28x = 913,092.48 × 389,788.80
  4. Step 4: Simplify right side
    661,697.28x = 355,913,222,068.22
  5. Step 5: Solve for x
    x = 355,913,222,068.22/661,697.28
  6. Step 6: Final answer
    x = 537,879.23

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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.