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Finding the Fourth Proportional to 1,568.77, 2,165.03 and 979.90

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Solution

The fourth proportional to 1,568.77, 2,165.03 and 979.90 is: 1,352.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.77 : 2,165.03 = 979.90 : x
  2. Step 2: Convert to fraction form
    1,568.77/2,165.03 = 979.90/x
  3. Step 3: Cross multiply
    1,568.77x = 2,165.03 × 979.90
  4. Step 4: Simplify right side
    1,568.77x = 2,121,506.26
  5. Step 5: Solve for x
    x = 2,121,506.26/1,568.77
  6. Step 6: Final answer
    x = 1,352.34

Related Problems

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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.