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Finding the Fourth Proportional to 1,681, 2,319.78 and 945

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Solution

The fourth proportional to 1,681, 2,319.78 and 945 is: 1,304.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681 : 2,319.78 = 945 : x
  2. Step 2: Convert to fraction form
    1,681/2,319.78 = 945/x
  3. Step 3: Cross multiply
    1,681x = 2,319.78 × 945
  4. Step 4: Simplify right side
    1,681x = 2,192,192.10
  5. Step 5: Solve for x
    x = 2,192,192.10/1,681
  6. Step 6: Final answer
    x = 1,304.10

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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.