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Finding the Fourth Proportional to 255,728.40, 383,765.40 and 143,408.40

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Solution

The fourth proportional to 255,728.40, 383,765.40 and 143,408.40 is: 215,209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,728.40 : 383,765.40 = 143,408.40 : x
  2. Step 2: Convert to fraction form
    255,728.40/383,765.40 = 143,408.40/x
  3. Step 3: Cross multiply
    255,728.40x = 383,765.40 × 143,408.40
  4. Step 4: Simplify right side
    255,728.40x = 55,035,181,989.36
  5. Step 5: Solve for x
    x = 55,035,181,989.36/255,728.40
  6. Step 6: Final answer
    x = 215,209.50

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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.