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Finding the Fourth Proportional to 1,384.40, 1,908.28 and 1,089.16

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Solution

The fourth proportional to 1,384.40, 1,908.28 and 1,089.16 is: 1,501.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.40 : 1,908.28 = 1,089.16 : x
  2. Step 2: Convert to fraction form
    1,384.40/1,908.28 = 1,089.16/x
  3. Step 3: Cross multiply
    1,384.40x = 1,908.28 × 1,089.16
  4. Step 4: Simplify right side
    1,384.40x = 2,078,422.24
  5. Step 5: Solve for x
    x = 2,078,422.24/1,384.40
  6. Step 6: Final answer
    x = 1,501.32

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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.