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Finding the Fourth Proportional to 1,692.40, 2,539.04 and 999.64

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Solution

The fourth proportional to 1,692.40, 2,539.04 and 999.64 is: 1,499.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,692.40 : 2,539.04 = 999.64 : x
  2. Step 2: Convert to fraction form
    1,692.40/2,539.04 = 999.64/x
  3. Step 3: Cross multiply
    1,692.40x = 2,539.04 × 999.64
  4. Step 4: Simplify right side
    1,692.40x = 2,538,125.95
  5. Step 5: Solve for x
    x = 2,538,125.95/1,692.40
  6. Step 6: Final answer
    x = 1,499.72

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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.