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Finding the Fourth Proportional to 475,619.08, 655,978.70 and 421,228.39

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Solution

The fourth proportional to 475,619.08, 655,978.70 and 421,228.39 is: 580,962.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    475,619.08 : 655,978.70 = 421,228.39 : x
  2. Step 2: Convert to fraction form
    475,619.08/655,978.70 = 421,228.39/x
  3. Step 3: Cross multiply
    475,619.08x = 655,978.70 × 421,228.39
  4. Step 4: Simplify right side
    475,619.08x = 276,316,848,395.40
  5. Step 5: Solve for x
    x = 276,316,848,395.40/475,619.08
  6. Step 6: Final answer
    x = 580,962.50

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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.