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Finding the Fourth Proportional to 154,981.71, 213,881.87 and 86,071.49

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Solution

The fourth proportional to 154,981.71, 213,881.87 and 86,071.49 is: 118,782.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,981.71 : 213,881.87 = 86,071.49 : x
  2. Step 2: Convert to fraction form
    154,981.71/213,881.87 = 86,071.49/x
  3. Step 3: Cross multiply
    154,981.71x = 213,881.87 × 86,071.49
  4. Step 4: Simplify right side
    154,981.71x = 18,409,131,662.00
  5. Step 5: Solve for x
    x = 18,409,131,662.00/154,981.71
  6. Step 6: Final answer
    x = 118,782.60

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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.