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Finding the Fourth Proportional to 218,855.52, 302,043.87 and 128,287.60

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Solution

The fourth proportional to 218,855.52, 302,043.87 and 128,287.60 is: 177,050.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,855.52 : 302,043.87 = 128,287.60 : x
  2. Step 2: Convert to fraction form
    218,855.52/302,043.87 = 128,287.60/x
  3. Step 3: Cross multiply
    218,855.52x = 302,043.87 × 128,287.60
  4. Step 4: Simplify right side
    218,855.52x = 38,748,482,421.90
  5. Step 5: Solve for x
    x = 38,748,482,421.90/218,855.52
  6. Step 6: Final answer
    x = 177,050.51

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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.