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Finding the Fourth Proportional to 990.84, 1,365.12 and 695.64

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Solution

The fourth proportional to 990.84, 1,365.12 and 695.64 is: 958.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.84 : 1,365.12 = 695.64 : x
  2. Step 2: Convert to fraction form
    990.84/1,365.12 = 695.64/x
  3. Step 3: Cross multiply
    990.84x = 1,365.12 × 695.64
  4. Step 4: Simplify right side
    990.84x = 949,632.08
  5. Step 5: Solve for x
    x = 949,632.08/990.84
  6. Step 6: Final answer
    x = 958.41

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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.