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Finding the Fourth Proportional to 660,478.30, 990,405.19 and 255,860.03

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Solution

The fourth proportional to 660,478.30, 990,405.19 and 255,860.03 is: 383,669.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,478.30 : 990,405.19 = 255,860.03 : x
  2. Step 2: Convert to fraction form
    660,478.30/990,405.19 = 255,860.03/x
  3. Step 3: Cross multiply
    660,478.30x = 990,405.19 × 255,860.03
  4. Step 4: Simplify right side
    660,478.30x = 253,405,104,421.39
  5. Step 5: Solve for x
    x = 253,405,104,421.39/660,478.30
  6. Step 6: Final answer
    x = 383,669.09

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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.