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Finding the Fourth Proportional to 620,812.49, 856,644.35 and 359,212.76

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Solution

The fourth proportional to 620,812.49, 856,644.35 and 359,212.76 is: 495,669.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,812.49 : 856,644.35 = 359,212.76 : x
  2. Step 2: Convert to fraction form
    620,812.49/856,644.35 = 359,212.76/x
  3. Step 3: Cross multiply
    620,812.49x = 856,644.35 × 359,212.76
  4. Step 4: Simplify right side
    620,812.49x = 307,717,581,301.91
  5. Step 5: Solve for x
    x = 307,717,581,301.91/620,812.49
  6. Step 6: Final answer
    x = 495,669.12

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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.