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Finding the Fourth Proportional to 621,938.64, 858,403.80 and 406,678.80

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Solution

The fourth proportional to 621,938.64, 858,403.80 and 406,678.80 is: 561,300.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,938.64 : 858,403.80 = 406,678.80 : x
  2. Step 2: Convert to fraction form
    621,938.64/858,403.80 = 406,678.80/x
  3. Step 3: Cross multiply
    621,938.64x = 858,403.80 × 406,678.80
  4. Step 4: Simplify right side
    621,938.64x = 349,094,627,299.44
  5. Step 5: Solve for x
    x = 349,094,627,299.44/621,938.64
  6. Step 6: Final answer
    x = 561,300.75

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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.