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Finding the Fourth Proportional to 317,987.20, 476,980.80 and 81,348.40

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Solution

The fourth proportional to 317,987.20, 476,980.80 and 81,348.40 is: 122,022.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,987.20 : 476,980.80 = 81,348.40 : x
  2. Step 2: Convert to fraction form
    317,987.20/476,980.80 = 81,348.40/x
  3. Step 3: Cross multiply
    317,987.20x = 476,980.80 × 81,348.40
  4. Step 4: Simplify right side
    317,987.20x = 38,801,624,910.72
  5. Step 5: Solve for x
    x = 38,801,624,910.72/317,987.20
  6. Step 6: Final answer
    x = 122,022.60

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1.5x scale

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.