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Finding the Fourth Proportional to 1,225.32, 1,690.90 and 701.32

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Solution

The fourth proportional to 1,225.32, 1,690.90 and 701.32 is: 967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.32 : 1,690.90 = 701.32 : x
  2. Step 2: Convert to fraction form
    1,225.32/1,690.90 = 701.32/x
  3. Step 3: Cross multiply
    1,225.32x = 1,690.90 × 701.32
  4. Step 4: Simplify right side
    1,225.32x = 1,185,861.99
  5. Step 5: Solve for x
    x = 1,185,861.99/1,225.32
  6. Step 6: Final answer
    x = 967.80

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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.