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Finding the Fourth Proportional to 1,312.70, 1,812.41 and 919.04

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Solution

The fourth proportional to 1,312.70, 1,812.41 and 919.04 is: 1,268.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.70 : 1,812.41 = 919.04 : x
  2. Step 2: Convert to fraction form
    1,312.70/1,812.41 = 919.04/x
  3. Step 3: Cross multiply
    1,312.70x = 1,812.41 × 919.04
  4. Step 4: Simplify right side
    1,312.70x = 1,665,679.04
  5. Step 5: Solve for x
    x = 1,665,679.04/1,312.70
  6. Step 6: Final answer
    x = 1,268.90

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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.