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Finding the Fourth Proportional to 1,985.16, 2,978.96 and 1,011.96

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Solution

The fourth proportional to 1,985.16, 2,978.96 and 1,011.96 is: 1,518.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.16 : 2,978.96 = 1,011.96 : x
  2. Step 2: Convert to fraction form
    1,985.16/2,978.96 = 1,011.96/x
  3. Step 3: Cross multiply
    1,985.16x = 2,978.96 × 1,011.96
  4. Step 4: Simplify right side
    1,985.16x = 3,014,588.36
  5. Step 5: Solve for x
    x = 3,014,588.36/1,985.16
  6. Step 6: Final answer
    x = 1,518.56

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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.