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Finding the Fourth Proportional to 719.76, 1,080.06 and 286.86

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Solution

The fourth proportional to 719.76, 1,080.06 and 286.86 is: 430.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.76 : 1,080.06 = 286.86 : x
  2. Step 2: Convert to fraction form
    719.76/1,080.06 = 286.86/x
  3. Step 3: Cross multiply
    719.76x = 1,080.06 × 286.86
  4. Step 4: Simplify right side
    719.76x = 309,826.01
  5. Step 5: Solve for x
    x = 309,826.01/719.76
  6. Step 6: Final answer
    x = 430.46

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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.