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Finding the Fourth Proportional to 290,728.32, 436,088.16 and 80,361.60

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Solution

The fourth proportional to 290,728.32, 436,088.16 and 80,361.60 is: 120,541.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,728.32 : 436,088.16 = 80,361.60 : x
  2. Step 2: Convert to fraction form
    290,728.32/436,088.16 = 80,361.60/x
  3. Step 3: Cross multiply
    290,728.32x = 436,088.16 × 80,361.60
  4. Step 4: Simplify right side
    290,728.32x = 35,044,742,278.66
  5. Step 5: Solve for x
    x = 35,044,742,278.66/290,728.32
  6. Step 6: Final answer
    x = 120,541.21

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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.