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Finding the Fourth Proportional to 1,442.64, 1,988.64 and 1,384.32

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Solution

The fourth proportional to 1,442.64, 1,988.64 and 1,384.32 is: 1,908.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.64 : 1,988.64 = 1,384.32 : x
  2. Step 2: Convert to fraction form
    1,442.64/1,988.64 = 1,384.32/x
  3. Step 3: Cross multiply
    1,442.64x = 1,988.64 × 1,384.32
  4. Step 4: Simplify right side
    1,442.64x = 2,752,914.12
  5. Step 5: Solve for x
    x = 2,752,914.12/1,442.64
  6. Step 6: Final answer
    x = 1,908.25

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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.