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Finding the Fourth Proportional to 719.98, 1,078.76 and 692.98

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Solution

The fourth proportional to 719.98, 1,078.76 and 692.98 is: 1,038.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.98 : 1,078.76 = 692.98 : x
  2. Step 2: Convert to fraction form
    719.98/1,078.76 = 692.98/x
  3. Step 3: Cross multiply
    719.98x = 1,078.76 × 692.98
  4. Step 4: Simplify right side
    719.98x = 747,559.10
  5. Step 5: Solve for x
    x = 747,559.10/719.98
  6. Step 6: Final answer
    x = 1,038.31

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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.