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Finding the Fourth Proportional to 1,130.88, 1,698.56 and 687.06

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Solution

The fourth proportional to 1,130.88, 1,698.56 and 687.06 is: 1,031.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.88 : 1,698.56 = 687.06 : x
  2. Step 2: Convert to fraction form
    1,130.88/1,698.56 = 687.06/x
  3. Step 3: Cross multiply
    1,130.88x = 1,698.56 × 687.06
  4. Step 4: Simplify right side
    1,130.88x = 1,167,012.63
  5. Step 5: Solve for x
    x = 1,167,012.63/1,130.88
  6. Step 6: Final answer
    x = 1,031.95

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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.