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Finding the Fourth Proportional to 218,857.55, 302,098.80 and 128,242.85

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Solution

The fourth proportional to 218,857.55, 302,098.80 and 128,242.85 is: 177,019.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,857.55 : 302,098.80 = 128,242.85 : x
  2. Step 2: Convert to fraction form
    218,857.55/302,098.80 = 128,242.85/x
  3. Step 3: Cross multiply
    218,857.55x = 302,098.80 × 128,242.85
  4. Step 4: Simplify right side
    218,857.55x = 38,742,009,583.09
  5. Step 5: Solve for x
    x = 38,742,009,583.09/218,857.55
  6. Step 6: Final answer
    x = 177,019.30

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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.