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Finding the Fourth Proportional to 172,172.57, 258,258.51 and 45,812.81

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Solution

The fourth proportional to 172,172.57, 258,258.51 and 45,812.81 is: 68,719.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,172.57 : 258,258.51 = 45,812.81 : x
  2. Step 2: Convert to fraction form
    172,172.57/258,258.51 = 45,812.81/x
  3. Step 3: Cross multiply
    172,172.57x = 258,258.51 × 45,812.81
  4. Step 4: Simplify right side
    172,172.57x = 11,831,546,758.22
  5. Step 5: Solve for x
    x = 11,831,546,758.22/172,172.57
  6. Step 6: Final answer
    x = 68,719.12

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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.