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Finding the Fourth Proportional to 686,604.90, 947,510.22 and 380,681.40

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Solution

The fourth proportional to 686,604.90, 947,510.22 and 380,681.40 is: 525,337.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,604.90 : 947,510.22 = 380,681.40 : x
  2. Step 2: Convert to fraction form
    686,604.90/947,510.22 = 380,681.40/x
  3. Step 3: Cross multiply
    686,604.90x = 947,510.22 × 380,681.40
  4. Step 4: Simplify right side
    686,604.90x = 360,699,517,063.91
  5. Step 5: Solve for x
    x = 360,699,517,063.91/686,604.90
  6. Step 6: Final answer
    x = 525,337.81

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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.