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Finding the Fourth Proportional to 806,931.40, 1,210,742.70 and 412,947.40

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Solution

The fourth proportional to 806,931.40, 1,210,742.70 and 412,947.40 is: 619,597.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    806,931.40 : 1,210,742.70 = 412,947.40 : x
  2. Step 2: Convert to fraction form
    806,931.40/1,210,742.70 = 412,947.40/x
  3. Step 3: Cross multiply
    806,931.40x = 1,210,742.70 × 412,947.40
  4. Step 4: Simplify right side
    806,931.40x = 499,973,050,033.98
  5. Step 5: Solve for x
    x = 499,973,050,033.98/806,931.40
  6. Step 6: Final answer
    x = 619,597.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.