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Finding the Fourth Proportional to 103,878.70, 155,890.95 and 66,529.60

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Solution

The fourth proportional to 103,878.70, 155,890.95 and 66,529.60 is: 99,841.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,878.70 : 155,890.95 = 66,529.60 : x
  2. Step 2: Convert to fraction form
    103,878.70/155,890.95 = 66,529.60/x
  3. Step 3: Cross multiply
    103,878.70x = 155,890.95 × 66,529.60
  4. Step 4: Simplify right side
    103,878.70x = 10,371,362,547.12
  5. Step 5: Solve for x
    x = 10,371,362,547.12/103,878.70
  6. Step 6: Final answer
    x = 99,841.09

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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.