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Finding the Fourth Proportional to 459,381.60, 687,128.40 and 412,336.80

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Solution

The fourth proportional to 459,381.60, 687,128.40 and 412,336.80 is: 616,760.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,381.60 : 687,128.40 = 412,336.80 : x
  2. Step 2: Convert to fraction form
    459,381.60/687,128.40 = 412,336.80/x
  3. Step 3: Cross multiply
    459,381.60x = 687,128.40 × 412,336.80
  4. Step 4: Simplify right side
    459,381.60x = 283,328,325,645.12
  5. Step 5: Solve for x
    x = 283,328,325,645.12/459,381.60
  6. Step 6: Final answer
    x = 616,760.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.