Home / 645,902.32-890,840.28-419,620.72

Finding the Fourth Proportional to 645,902.32, 890,840.28 and 419,620.72

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Solution

The fourth proportional to 645,902.32, 890,840.28 and 419,620.72 is: 578,748.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,902.32 : 890,840.28 = 419,620.72 : x
  2. Step 2: Convert to fraction form
    645,902.32/890,840.28 = 419,620.72/x
  3. Step 3: Cross multiply
    645,902.32x = 890,840.28 × 419,620.72
  4. Step 4: Simplify right side
    645,902.32x = 373,815,039,698.60
  5. Step 5: Solve for x
    x = 373,815,039,698.60/645,902.32
  6. Step 6: Final answer
    x = 578,748.56

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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.