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Finding the Fourth Proportional to 1,312.96, 1,812 and 815.62

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Solution

The fourth proportional to 1,312.96, 1,812 and 815.62 is: 1,125.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.96 : 1,812 = 815.62 : x
  2. Step 2: Convert to fraction form
    1,312.96/1,812 = 815.62/x
  3. Step 3: Cross multiply
    1,312.96x = 1,812 × 815.62
  4. Step 4: Simplify right side
    1,312.96x = 1,477,903.44
  5. Step 5: Solve for x
    x = 1,477,903.44/1,312.96
  6. Step 6: Final answer
    x = 1,125.63

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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.