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Finding the Fourth Proportional to 644,686.60, 966,689.70 and 218,075.80

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Solution

The fourth proportional to 644,686.60, 966,689.70 and 218,075.80 is: 326,998.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,686.60 : 966,689.70 = 218,075.80 : x
  2. Step 2: Convert to fraction form
    644,686.60/966,689.70 = 218,075.80/x
  3. Step 3: Cross multiply
    644,686.60x = 966,689.70 × 218,075.80
  4. Step 4: Simplify right side
    644,686.60x = 210,811,629,679.26
  5. Step 5: Solve for x
    x = 210,811,629,679.26/644,686.60
  6. Step 6: Final answer
    x = 326,998.62

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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.