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Finding the Fourth Proportional to 2,079.78, 3,117.30 and 692.79

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Solution

The fourth proportional to 2,079.78, 3,117.30 and 692.79 is: 1,038.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.78 : 3,117.30 = 692.79 : x
  2. Step 2: Convert to fraction form
    2,079.78/3,117.30 = 692.79/x
  3. Step 3: Cross multiply
    2,079.78x = 3,117.30 × 692.79
  4. Step 4: Simplify right side
    2,079.78x = 2,159,634.27
  5. Step 5: Solve for x
    x = 2,159,634.27/2,079.78
  6. Step 6: Final answer
    x = 1,038.40

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1.5x scale

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.