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Finding the Fourth Proportional to 122,490.63, 168,994.39 and 77,172.66

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Solution

The fourth proportional to 122,490.63, 168,994.39 and 77,172.66 is: 106,471.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,490.63 : 168,994.39 = 77,172.66 : x
  2. Step 2: Convert to fraction form
    122,490.63/168,994.39 = 77,172.66/x
  3. Step 3: Cross multiply
    122,490.63x = 168,994.39 × 77,172.66
  4. Step 4: Simplify right side
    122,490.63x = 13,041,746,601.38
  5. Step 5: Solve for x
    x = 13,041,746,601.38/122,490.63
  6. Step 6: Final answer
    x = 106,471.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.