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Finding the Fourth Proportional to 620,103.22, 855,526.38 and 390,681

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Solution

The fourth proportional to 620,103.22, 855,526.38 and 390,681 is: 539,003.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,103.22 : 855,526.38 = 390,681 : x
  2. Step 2: Convert to fraction form
    620,103.22/855,526.38 = 390,681/x
  3. Step 3: Cross multiply
    620,103.22x = 855,526.38 × 390,681
  4. Step 4: Simplify right side
    620,103.22x = 334,237,901,664.78
  5. Step 5: Solve for x
    x = 334,237,901,664.78/620,103.22
  6. Step 6: Final answer
    x = 539,003.65

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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.