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Finding the Fourth Proportional to 620,104.22, 855,527.76 and 390,682

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Solution

The fourth proportional to 620,104.22, 855,527.76 and 390,682 is: 539,005.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,104.22 : 855,527.76 = 390,682 : x
  2. Step 2: Convert to fraction form
    620,104.22/855,527.76 = 390,682/x
  3. Step 3: Cross multiply
    620,104.22x = 855,527.76 × 390,682
  4. Step 4: Simplify right side
    620,104.22x = 334,239,296,332.32
  5. Step 5: Solve for x
    x = 334,239,296,332.32/620,104.22
  6. Step 6: Final answer
    x = 539,005.03

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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.