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Finding the Fourth Proportional to 1,070.28, 1,603.19 and 992.42

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Solution

The fourth proportional to 1,070.28, 1,603.19 and 992.42 is: 1,486.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.28 : 1,603.19 = 992.42 : x
  2. Step 2: Convert to fraction form
    1,070.28/1,603.19 = 992.42/x
  3. Step 3: Cross multiply
    1,070.28x = 1,603.19 × 992.42
  4. Step 4: Simplify right side
    1,070.28x = 1,591,041.30
  5. Step 5: Solve for x
    x = 1,591,041.30/1,070.28
  6. Step 6: Final answer
    x = 1,486.57

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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.