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Finding the Fourth Proportional to 270,612.80, 405,919.20 and 83,681.60

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Solution

The fourth proportional to 270,612.80, 405,919.20 and 83,681.60 is: 125,522.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    270,612.80 : 405,919.20 = 83,681.60 : x
  2. Step 2: Convert to fraction form
    270,612.80/405,919.20 = 83,681.60/x
  3. Step 3: Cross multiply
    270,612.80x = 405,919.20 × 83,681.60
  4. Step 4: Simplify right side
    270,612.80x = 33,967,968,126.72
  5. Step 5: Solve for x
    x = 33,967,968,126.72/270,612.80
  6. Step 6: Final answer
    x = 125,522.40

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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.