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Finding the Fourth Proportional to 719.51, 1,080.56 and 661.62

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Solution

The fourth proportional to 719.51, 1,080.56 and 661.62 is: 993.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.51 : 1,080.56 = 661.62 : x
  2. Step 2: Convert to fraction form
    719.51/1,080.56 = 661.62/x
  3. Step 3: Cross multiply
    719.51x = 1,080.56 × 661.62
  4. Step 4: Simplify right side
    719.51x = 714,921.76
  5. Step 5: Solve for x
    x = 714,921.76/719.51
  6. Step 6: Final answer
    x = 993.63

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1.5x scale

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.