Home / 645,904.32-890,843.04-419,622.72

Finding the Fourth Proportional to 645,904.32, 890,843.04 and 419,622.72

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Solution

The fourth proportional to 645,904.32, 890,843.04 and 419,622.72 is: 578,751.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,904.32 : 890,843.04 = 419,622.72 : x
  2. Step 2: Convert to fraction form
    645,904.32/890,843.04 = 419,622.72/x
  3. Step 3: Cross multiply
    645,904.32x = 890,843.04 × 419,622.72
  4. Step 4: Simplify right side
    645,904.32x = 373,817,979,537.87
  5. Step 5: Solve for x
    x = 373,817,979,537.87/645,904.32
  6. Step 6: Final answer
    x = 578,751.32

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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.