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Finding the Fourth Proportional to 665,779.48, 918,657.57 and 393,858.83

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Solution

The fourth proportional to 665,779.48, 918,657.57 and 393,858.83 is: 543,455.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,779.48 : 918,657.57 = 393,858.83 : x
  2. Step 2: Convert to fraction form
    665,779.48/918,657.57 = 393,858.83/x
  3. Step 3: Cross multiply
    665,779.48x = 918,657.57 × 393,858.83
  4. Step 4: Simplify right side
    665,779.48x = 361,821,395,690.84
  5. Step 5: Solve for x
    x = 361,821,395,690.84/665,779.48
  6. Step 6: Final answer
    x = 543,455.31

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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.