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Finding the Fourth Proportional to 620,398.17, 855,931.46 and 405,663.93

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Solution

The fourth proportional to 620,398.17, 855,931.46 and 405,663.93 is: 559,673.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,398.17 : 855,931.46 = 405,663.93 : x
  2. Step 2: Convert to fraction form
    620,398.17/855,931.46 = 405,663.93/x
  3. Step 3: Cross multiply
    620,398.17x = 855,931.46 × 405,663.93
  4. Step 4: Simplify right side
    620,398.17x = 347,220,517,845.92
  5. Step 5: Solve for x
    x = 347,220,517,845.92/620,398.17
  6. Step 6: Final answer
    x = 559,673.67

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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.