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Finding the Fourth Proportional to 1,037.06, 1,430.43 and 992.78

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Solution

The fourth proportional to 1,037.06, 1,430.43 and 992.78 is: 1,369.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.06 : 1,430.43 = 992.78 : x
  2. Step 2: Convert to fraction form
    1,037.06/1,430.43 = 992.78/x
  3. Step 3: Cross multiply
    1,037.06x = 1,430.43 × 992.78
  4. Step 4: Simplify right side
    1,037.06x = 1,420,102.30
  5. Step 5: Solve for x
    x = 1,420,102.30/1,037.06
  6. Step 6: Final answer
    x = 1,369.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.