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Finding the Fourth Proportional to 69,130.78, 103,696.10 and 19,210.85

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Solution

The fourth proportional to 69,130.78, 103,696.10 and 19,210.85 is: 28,816.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,130.78 : 103,696.10 = 19,210.85 : x
  2. Step 2: Convert to fraction form
    69,130.78/103,696.10 = 19,210.85/x
  3. Step 3: Cross multiply
    69,130.78x = 103,696.10 × 19,210.85
  4. Step 4: Simplify right side
    69,130.78x = 1,992,090,222.69
  5. Step 5: Solve for x
    x = 1,992,090,222.69/69,130.78
  6. Step 6: Final answer
    x = 28,816.26

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1.5x scale

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.