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Finding the Fourth Proportional to 1,279.48, 1,920.16 and 630.68

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Solution

The fourth proportional to 1,279.48, 1,920.16 and 630.68 is: 946.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.48 : 1,920.16 = 630.68 : x
  2. Step 2: Convert to fraction form
    1,279.48/1,920.16 = 630.68/x
  3. Step 3: Cross multiply
    1,279.48x = 1,920.16 × 630.68
  4. Step 4: Simplify right side
    1,279.48x = 1,211,006.51
  5. Step 5: Solve for x
    x = 1,211,006.51/1,279.48
  6. Step 6: Final answer
    x = 946.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.