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Finding the Fourth Proportional to 877.46, 1,315.92 and 774.86

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Solution

The fourth proportional to 877.46, 1,315.92 and 774.86 is: 1,162.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.46 : 1,315.92 = 774.86 : x
  2. Step 2: Convert to fraction form
    877.46/1,315.92 = 774.86/x
  3. Step 3: Cross multiply
    877.46x = 1,315.92 × 774.86
  4. Step 4: Simplify right side
    877.46x = 1,019,653.77
  5. Step 5: Solve for x
    x = 1,019,653.77/877.46
  6. Step 6: Final answer
    x = 1,162.05

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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.