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Finding the Fourth Proportional to 1,188.40, 1,639.64 and 690.92

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Solution

The fourth proportional to 1,188.40, 1,639.64 and 690.92 is: 953.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.40 : 1,639.64 = 690.92 : x
  2. Step 2: Convert to fraction form
    1,188.40/1,639.64 = 690.92/x
  3. Step 3: Cross multiply
    1,188.40x = 1,639.64 × 690.92
  4. Step 4: Simplify right side
    1,188.40x = 1,132,860.07
  5. Step 5: Solve for x
    x = 1,132,860.07/1,188.40
  6. Step 6: Final answer
    x = 953.26

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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.