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Finding the Fourth Proportional to 1,985.70, 2,977.46 and 752.77

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Solution

The fourth proportional to 1,985.70, 2,977.46 and 752.77 is: 1,128.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.70 : 2,977.46 = 752.77 : x
  2. Step 2: Convert to fraction form
    1,985.70/2,977.46 = 752.77/x
  3. Step 3: Cross multiply
    1,985.70x = 2,977.46 × 752.77
  4. Step 4: Simplify right side
    1,985.70x = 2,241,342.56
  5. Step 5: Solve for x
    x = 2,241,342.56/1,985.70
  6. Step 6: Final answer
    x = 1,128.74

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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.