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Finding the Fourth Proportional to 687.90, 1,032.60 and 277.32

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Solution

The fourth proportional to 687.90, 1,032.60 and 277.32 is: 416.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.90 : 1,032.60 = 277.32 : x
  2. Step 2: Convert to fraction form
    687.90/1,032.60 = 277.32/x
  3. Step 3: Cross multiply
    687.90x = 1,032.60 × 277.32
  4. Step 4: Simplify right side
    687.90x = 286,360.63
  5. Step 5: Solve for x
    x = 286,360.63/687.90
  6. Step 6: Final answer
    x = 416.28

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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.