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Finding the Fourth Proportional to 1,678.26, 2,315.98 and 970.51

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Solution

The fourth proportional to 1,678.26, 2,315.98 and 970.51 is: 1,339.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.26 : 2,315.98 = 970.51 : x
  2. Step 2: Convert to fraction form
    1,678.26/2,315.98 = 970.51/x
  3. Step 3: Cross multiply
    1,678.26x = 2,315.98 × 970.51
  4. Step 4: Simplify right side
    1,678.26x = 2,247,681.75
  5. Step 5: Solve for x
    x = 2,247,681.75/1,678.26
  6. Step 6: Final answer
    x = 1,339.29

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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.