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Finding the Fourth Proportional to 391,065.84, 539,666.52 and 218,985.36

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Solution

The fourth proportional to 391,065.84, 539,666.52 and 218,985.36 is: 302,197.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,065.84 : 539,666.52 = 218,985.36 : x
  2. Step 2: Convert to fraction form
    391,065.84/539,666.52 = 218,985.36/x
  3. Step 3: Cross multiply
    391,065.84x = 539,666.52 × 218,985.36
  4. Step 4: Simplify right side
    391,065.84x = 118,179,067,162.15
  5. Step 5: Solve for x
    x = 118,179,067,162.15/391,065.84
  6. Step 6: Final answer
    x = 302,197.37

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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.