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Finding the Fourth Proportional to 391,368.52, 540,090.68 and 221,635.72

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Solution

The fourth proportional to 391,368.52, 540,090.68 and 221,635.72 is: 305,858.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,368.52 : 540,090.68 = 221,635.72 : x
  2. Step 2: Convert to fraction form
    391,368.52/540,090.68 = 221,635.72/x
  3. Step 3: Cross multiply
    391,368.52x = 540,090.68 × 221,635.72
  4. Step 4: Simplify right side
    391,368.52x = 119,703,386,727.09
  5. Step 5: Solve for x
    x = 119,703,386,727.09/391,368.52
  6. Step 6: Final answer
    x = 305,858.50

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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.