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Finding the Fourth Proportional to 218,991, 302,208.30 and 118,389.72

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Solution

The fourth proportional to 218,991, 302,208.30 and 118,389.72 is: 163,378.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,991 : 302,208.30 = 118,389.72 : x
  2. Step 2: Convert to fraction form
    218,991/302,208.30 = 118,389.72/x
  3. Step 3: Cross multiply
    218,991x = 302,208.30 × 118,389.72
  4. Step 4: Simplify right side
    218,991x = 35,778,356,018.68
  5. Step 5: Solve for x
    x = 35,778,356,018.68/218,991
  6. Step 6: Final answer
    x = 163,378.20

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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.