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Finding the Fourth Proportional to 692.94, 1,039.20 and 570.90

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Solution

The fourth proportional to 692.94, 1,039.20 and 570.90 is: 856.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.94 : 1,039.20 = 570.90 : x
  2. Step 2: Convert to fraction form
    692.94/1,039.20 = 570.90/x
  3. Step 3: Cross multiply
    692.94x = 1,039.20 × 570.90
  4. Step 4: Simplify right side
    692.94x = 593,279.28
  5. Step 5: Solve for x
    x = 593,279.28/692.94
  6. Step 6: Final answer
    x = 856.18

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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.