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Finding the Fourth Proportional to 1,230.19, 1,697.72 and 670.64

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Solution

The fourth proportional to 1,230.19, 1,697.72 and 670.64 is: 925.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.19 : 1,697.72 = 670.64 : x
  2. Step 2: Convert to fraction form
    1,230.19/1,697.72 = 670.64/x
  3. Step 3: Cross multiply
    1,230.19x = 1,697.72 × 670.64
  4. Step 4: Simplify right side
    1,230.19x = 1,138,558.94
  5. Step 5: Solve for x
    x = 1,138,558.94/1,230.19
  6. Step 6: Final answer
    x = 925.52

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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.