Home / 645,901.32-890,838.90-419,619.72

Finding the Fourth Proportional to 645,901.32, 890,838.90 and 419,619.72

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Solution

The fourth proportional to 645,901.32, 890,838.90 and 419,619.72 is: 578,747.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,901.32 : 890,838.90 = 419,619.72 : x
  2. Step 2: Convert to fraction form
    645,901.32/890,838.90 = 419,619.72/x
  3. Step 3: Cross multiply
    645,901.32x = 890,838.90 × 419,619.72
  4. Step 4: Simplify right side
    645,901.32x = 373,813,569,783.11
  5. Step 5: Solve for x
    x = 373,813,569,783.11/645,901.32
  6. Step 6: Final answer
    x = 578,747.18

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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.