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Finding the Fourth Proportional to 959.74, 1,431.53 and 803.86

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Solution

The fourth proportional to 959.74, 1,431.53 and 803.86 is: 1,199.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.74 : 1,431.53 = 803.86 : x
  2. Step 2: Convert to fraction form
    959.74/1,431.53 = 803.86/x
  3. Step 3: Cross multiply
    959.74x = 1,431.53 × 803.86
  4. Step 4: Simplify right side
    959.74x = 1,150,749.71
  5. Step 5: Solve for x
    x = 1,150,749.71/959.74
  6. Step 6: Final answer
    x = 1,199.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.