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Finding the Fourth Proportional to 208,181.40, 312,361.20 and 66,038.28

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Solution

The fourth proportional to 208,181.40, 312,361.20 and 66,038.28 is: 99,085.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,181.40 : 312,361.20 = 66,038.28 : x
  2. Step 2: Convert to fraction form
    208,181.40/312,361.20 = 66,038.28/x
  3. Step 3: Cross multiply
    208,181.40x = 312,361.20 × 66,038.28
  4. Step 4: Simplify right side
    208,181.40x = 20,627,796,386.74
  5. Step 5: Solve for x
    x = 20,627,796,386.74/208,181.40
  6. Step 6: Final answer
    x = 99,085.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.