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Finding the Fourth Proportional to 1,230.30, 1,697.40 and 706.32

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Solution

The fourth proportional to 1,230.30, 1,697.40 and 706.32 is: 974.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.30 : 1,697.40 = 706.32 : x
  2. Step 2: Convert to fraction form
    1,230.30/1,697.40 = 706.32/x
  3. Step 3: Cross multiply
    1,230.30x = 1,697.40 × 706.32
  4. Step 4: Simplify right side
    1,230.30x = 1,198,907.57
  5. Step 5: Solve for x
    x = 1,198,907.57/1,230.30
  6. Step 6: Final answer
    x = 974.48

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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.