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Finding the Fourth Proportional to 68,368, 102,552.72 and 19,120

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Solution

The fourth proportional to 68,368, 102,552.72 and 19,120 is: 28,680.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,368 : 102,552.72 = 19,120 : x
  2. Step 2: Convert to fraction form
    68,368/102,552.72 = 19,120/x
  3. Step 3: Cross multiply
    68,368x = 102,552.72 × 19,120
  4. Step 4: Simplify right side
    68,368x = 1,960,808,006.40
  5. Step 5: Solve for x
    x = 1,960,808,006.40/68,368
  6. Step 6: Final answer
    x = 28,680.20

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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.