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Finding the Fourth Proportional to 147,920.84, 221,880.72 and 68,991.20

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Solution

The fourth proportional to 147,920.84, 221,880.72 and 68,991.20 is: 103,486.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,920.84 : 221,880.72 = 68,991.20 : x
  2. Step 2: Convert to fraction form
    147,920.84/221,880.72 = 68,991.20/x
  3. Step 3: Cross multiply
    147,920.84x = 221,880.72 × 68,991.20
  4. Step 4: Simplify right side
    147,920.84x = 15,307,817,129.66
  5. Step 5: Solve for x
    x = 15,307,817,129.66/147,920.84
  6. Step 6: Final answer
    x = 103,486.55

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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.