Home / 1,666.20-2,499.45-692.10

Finding the Fourth Proportional to 1,666.20, 2,499.45 and 692.10

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Solution

The fourth proportional to 1,666.20, 2,499.45 and 692.10 is: 1,038.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.20 : 2,499.45 = 692.10 : x
  2. Step 2: Convert to fraction form
    1,666.20/2,499.45 = 692.10/x
  3. Step 3: Cross multiply
    1,666.20x = 2,499.45 × 692.10
  4. Step 4: Simplify right side
    1,666.20x = 1,729,869.35
  5. Step 5: Solve for x
    x = 1,729,869.35/1,666.20
  6. Step 6: Final answer
    x = 1,038.21

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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.