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Finding the Fourth Proportional to 1,642.76, 2,266.07 and 979.56

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Solution

The fourth proportional to 1,642.76, 2,266.07 and 979.56 is: 1,351.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.76 : 2,266.07 = 979.56 : x
  2. Step 2: Convert to fraction form
    1,642.76/2,266.07 = 979.56/x
  3. Step 3: Cross multiply
    1,642.76x = 2,266.07 × 979.56
  4. Step 4: Simplify right side
    1,642.76x = 2,219,746.63
  5. Step 5: Solve for x
    x = 2,219,746.63/1,642.76
  6. Step 6: Final answer
    x = 1,351.23

Related Problems

Find fourth proportional to 821.38, 1,133.03 and 489.78
Half scale
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Double scale
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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.