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Finding the Fourth Proportional to 620,102.22, 855,525 and 390,680

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Solution

The fourth proportional to 620,102.22, 855,525 and 390,680 is: 539,002.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,102.22 : 855,525 = 390,680 : x
  2. Step 2: Convert to fraction form
    620,102.22/855,525 = 390,680/x
  3. Step 3: Cross multiply
    620,102.22x = 855,525 × 390,680
  4. Step 4: Simplify right side
    620,102.22x = 334,236,507,000
  5. Step 5: Solve for x
    x = 334,236,507,000/620,102.22
  6. Step 6: Final answer
    x = 539,002.27

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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.