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Finding the Fourth Proportional to 1,318.16, 1,821.28 and 919.28

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Solution

The fourth proportional to 1,318.16, 1,821.28 and 919.28 is: 1,270.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.16 : 1,821.28 = 919.28 : x
  2. Step 2: Convert to fraction form
    1,318.16/1,821.28 = 919.28/x
  3. Step 3: Cross multiply
    1,318.16x = 1,821.28 × 919.28
  4. Step 4: Simplify right side
    1,318.16x = 1,674,266.28
  5. Step 5: Solve for x
    x = 1,674,266.28/1,318.16
  6. Step 6: Final answer
    x = 1,270.15

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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.