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Finding the Fourth Proportional to 1,184.94, 1,635.12 and 687.42

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Solution

The fourth proportional to 1,184.94, 1,635.12 and 687.42 is: 948.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,184.94 : 1,635.12 = 687.42 : x
  2. Step 2: Convert to fraction form
    1,184.94/1,635.12 = 687.42/x
  3. Step 3: Cross multiply
    1,184.94x = 1,635.12 × 687.42
  4. Step 4: Simplify right side
    1,184.94x = 1,124,014.19
  5. Step 5: Solve for x
    x = 1,124,014.19/1,184.94
  6. Step 6: Final answer
    x = 948.58

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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.