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Finding the Fourth Proportional to 1,815.70, 2,505.64 and 987.70

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Solution

The fourth proportional to 1,815.70, 2,505.64 and 987.70 is: 1,363.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.70 : 2,505.64 = 987.70 : x
  2. Step 2: Convert to fraction form
    1,815.70/2,505.64 = 987.70/x
  3. Step 3: Cross multiply
    1,815.70x = 2,505.64 × 987.70
  4. Step 4: Simplify right side
    1,815.70x = 2,474,820.63
  5. Step 5: Solve for x
    x = 2,474,820.63/1,815.70
  6. Step 6: Final answer
    x = 1,363.01

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1.5x scale

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.