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Finding the Fourth Proportional to 620,686.18, 856,939.06 and 406,188.87

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Solution

The fourth proportional to 620,686.18, 856,939.06 and 406,188.87 is: 560,797.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,686.18 : 856,939.06 = 406,188.87 : x
  2. Step 2: Convert to fraction form
    620,686.18/856,939.06 = 406,188.87/x
  3. Step 3: Cross multiply
    620,686.18x = 856,939.06 × 406,188.87
  4. Step 4: Simplify right side
    620,686.18x = 348,079,108,440.26
  5. Step 5: Solve for x
    x = 348,079,108,440.26/620,686.18
  6. Step 6: Final answer
    x = 560,797.26

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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.