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Finding the Fourth Proportional to 620,978.18, 856,974.20 and 349,045.25

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Solution

The fourth proportional to 620,978.18, 856,974.20 and 349,045.25 is: 481,696.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,978.18 : 856,974.20 = 349,045.25 : x
  2. Step 2: Convert to fraction form
    620,978.18/856,974.20 = 349,045.25/x
  3. Step 3: Cross multiply
    620,978.18x = 856,974.20 × 349,045.25
  4. Step 4: Simplify right side
    620,978.18x = 299,122,767,852.45
  5. Step 5: Solve for x
    x = 299,122,767,852.45/620,978.18
  6. Step 6: Final answer
    x = 481,696.10

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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.