Home / 642,288.64-886,408.32-355,835.20

Finding the Fourth Proportional to 642,288.64, 886,408.32 and 355,835.20

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Solution

The fourth proportional to 642,288.64, 886,408.32 and 355,835.20 is: 491,080.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,288.64 : 886,408.32 = 355,835.20 : x
  2. Step 2: Convert to fraction form
    642,288.64/886,408.32 = 355,835.20/x
  3. Step 3: Cross multiply
    642,288.64x = 886,408.32 × 355,835.20
  4. Step 4: Simplify right side
    642,288.64x = 315,415,281,828.86
  5. Step 5: Solve for x
    x = 315,415,281,828.86/642,288.64
  6. Step 6: Final answer
    x = 491,080.27

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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.