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Finding the Fourth Proportional to 391,904.88, 540,826.20 and 213,056.88

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Solution

The fourth proportional to 391,904.88, 540,826.20 and 213,056.88 is: 294,017.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,904.88 : 540,826.20 = 213,056.88 : x
  2. Step 2: Convert to fraction form
    391,904.88/540,826.20 = 213,056.88/x
  3. Step 3: Cross multiply
    391,904.88x = 540,826.20 × 213,056.88
  4. Step 4: Simplify right side
    391,904.88x = 115,226,742,794.26
  5. Step 5: Solve for x
    x = 115,226,742,794.26/391,904.88
  6. Step 6: Final answer
    x = 294,017.12

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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.