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Finding the Fourth Proportional to 389,021.80, 583,532.70 and 326,813.80

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Solution

The fourth proportional to 389,021.80, 583,532.70 and 326,813.80 is: 490,220.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,021.80 : 583,532.70 = 326,813.80 : x
  2. Step 2: Convert to fraction form
    389,021.80/583,532.70 = 326,813.80/x
  3. Step 3: Cross multiply
    389,021.80x = 583,532.70 × 326,813.80
  4. Step 4: Simplify right side
    389,021.80x = 190,706,539,111.26
  5. Step 5: Solve for x
    x = 190,706,539,111.26/389,021.80
  6. Step 6: Final answer
    x = 490,220.70

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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.