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Finding the Fourth Proportional to 714,238.21, 985,677.15 and 391,959.84

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Solution

The fourth proportional to 714,238.21, 985,677.15 and 391,959.84 is: 540,920.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,238.21 : 985,677.15 = 391,959.84 : x
  2. Step 2: Convert to fraction form
    714,238.21/985,677.15 = 391,959.84/x
  3. Step 3: Cross multiply
    714,238.21x = 985,677.15 × 391,959.84
  4. Step 4: Simplify right side
    714,238.21x = 386,345,854,855.14
  5. Step 5: Solve for x
    x = 386,345,854,855.14/714,238.21
  6. Step 6: Final answer
    x = 540,920.17

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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.