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Finding the Fourth Proportional to 1,068.72, 1,603 and 635.50

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Solution

The fourth proportional to 1,068.72, 1,603 and 635.50 is: 953.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.72 : 1,603 = 635.50 : x
  2. Step 2: Convert to fraction form
    1,068.72/1,603 = 635.50/x
  3. Step 3: Cross multiply
    1,068.72x = 1,603 × 635.50
  4. Step 4: Simplify right side
    1,068.72x = 1,018,706.50
  5. Step 5: Solve for x
    x = 1,018,706.50/1,068.72
  6. Step 6: Final answer
    x = 953.20

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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.