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Finding the Fourth Proportional to 86,168.70, 128,572.16 and 74,504.70

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Solution

The fourth proportional to 86,168.70, 128,572.16 and 74,504.70 is: 111,168.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,168.70 : 128,572.16 = 74,504.70 : x
  2. Step 2: Convert to fraction form
    86,168.70/128,572.16 = 74,504.70/x
  3. Step 3: Cross multiply
    86,168.70x = 128,572.16 × 74,504.70
  4. Step 4: Simplify right side
    86,168.70x = 9,579,229,836.63
  5. Step 5: Solve for x
    x = 9,579,229,836.63/86,168.70
  6. Step 6: Final answer
    x = 111,168.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.