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Finding the Fourth Proportional to 700.63, 1,048.71 and 661.75

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Solution

The fourth proportional to 700.63, 1,048.71 and 661.75 is: 990.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.63 : 1,048.71 = 661.75 : x
  2. Step 2: Convert to fraction form
    700.63/1,048.71 = 661.75/x
  3. Step 3: Cross multiply
    700.63x = 1,048.71 × 661.75
  4. Step 4: Simplify right side
    700.63x = 693,983.84
  5. Step 5: Solve for x
    x = 693,983.84/700.63
  6. Step 6: Final answer
    x = 990.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.