Home / 645,111.59-890,389.43-409,212.87

Finding the Fourth Proportional to 645,111.59, 890,389.43 and 409,212.87

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Solution

The fourth proportional to 645,111.59, 890,389.43 and 409,212.87 is: 564,799.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,111.59 : 890,389.43 = 409,212.87 : x
  2. Step 2: Convert to fraction form
    645,111.59/890,389.43 = 409,212.87/x
  3. Step 3: Cross multiply
    645,111.59x = 890,389.43 × 409,212.87
  4. Step 4: Simplify right side
    645,111.59x = 364,358,812,021.90
  5. Step 5: Solve for x
    x = 364,358,812,021.90/645,111.59
  6. Step 6: Final answer
    x = 564,799.67

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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.