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Finding the Fourth Proportional to 1,291.59, 1,782.09 and 787.32

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Solution

The fourth proportional to 1,291.59, 1,782.09 and 787.32 is: 1,086.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.59 : 1,782.09 = 787.32 : x
  2. Step 2: Convert to fraction form
    1,291.59/1,782.09 = 787.32/x
  3. Step 3: Cross multiply
    1,291.59x = 1,782.09 × 787.32
  4. Step 4: Simplify right side
    1,291.59x = 1,403,075.10
  5. Step 5: Solve for x
    x = 1,403,075.10/1,291.59
  6. Step 6: Final answer
    x = 1,086.32

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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.