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Finding the Fourth Proportional to 1,985.46, 2,977.76 and 815.18

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Solution

The fourth proportional to 1,985.46, 2,977.76 and 815.18 is: 1,222.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.46 : 2,977.76 = 815.18 : x
  2. Step 2: Convert to fraction form
    1,985.46/2,977.76 = 815.18/x
  3. Step 3: Cross multiply
    1,985.46x = 2,977.76 × 815.18
  4. Step 4: Simplify right side
    1,985.46x = 2,427,391.43
  5. Step 5: Solve for x
    x = 2,427,391.43/1,985.46
  6. Step 6: Final answer
    x = 1,222.58

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1.5x scale

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.