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Finding the Fourth Proportional to 718,707.72, 991,812.62 and 396,417.09

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Solution

The fourth proportional to 718,707.72, 991,812.62 and 396,417.09 is: 547,053.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,707.72 : 991,812.62 = 396,417.09 : x
  2. Step 2: Convert to fraction form
    718,707.72/991,812.62 = 396,417.09/x
  3. Step 3: Cross multiply
    718,707.72x = 991,812.62 × 396,417.09
  4. Step 4: Simplify right side
    718,707.72x = 393,171,473,636.72
  5. Step 5: Solve for x
    x = 393,171,473,636.72/718,707.72
  6. Step 6: Final answer
    x = 547,053.36

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1.5x scale

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.