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Finding the Fourth Proportional to 681,473.81, 940,411.80 and 391,133.16

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Solution

The fourth proportional to 681,473.81, 940,411.80 and 391,133.16 is: 539,751.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,473.81 : 940,411.80 = 391,133.16 : x
  2. Step 2: Convert to fraction form
    681,473.81/940,411.80 = 391,133.16/x
  3. Step 3: Cross multiply
    681,473.81x = 940,411.80 × 391,133.16
  4. Step 4: Simplify right side
    681,473.81x = 367,826,239,035.29
  5. Step 5: Solve for x
    x = 367,826,239,035.29/681,473.81
  6. Step 6: Final answer
    x = 539,751.10

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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.