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Finding the Fourth Proportional to 835, 1,152.32 and 485.72

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Solution

The fourth proportional to 835, 1,152.32 and 485.72 is: 670.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    835 : 1,152.32 = 485.72 : x
  2. Step 2: Convert to fraction form
    835/1,152.32 = 485.72/x
  3. Step 3: Cross multiply
    835x = 1,152.32 × 485.72
  4. Step 4: Simplify right side
    835x = 559,704.87
  5. Step 5: Solve for x
    x = 559,704.87/835
  6. Step 6: Final answer
    x = 670.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.