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Finding the Fourth Proportional to 1,055.72, 1,584.50 and 690.95

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Solution

The fourth proportional to 1,055.72, 1,584.50 and 690.95 is: 1,037.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.72 : 1,584.50 = 690.95 : x
  2. Step 2: Convert to fraction form
    1,055.72/1,584.50 = 690.95/x
  3. Step 3: Cross multiply
    1,055.72x = 1,584.50 × 690.95
  4. Step 4: Simplify right side
    1,055.72x = 1,094,810.78
  5. Step 5: Solve for x
    x = 1,094,810.78/1,055.72
  6. Step 6: Final answer
    x = 1,037.03

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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.