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Finding the Fourth Proportional to 987.51, 1,359.99 and 965.98

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Solution

The fourth proportional to 987.51, 1,359.99 and 965.98 is: 1,330.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.51 : 1,359.99 = 965.98 : x
  2. Step 2: Convert to fraction form
    987.51/1,359.99 = 965.98/x
  3. Step 3: Cross multiply
    987.51x = 1,359.99 × 965.98
  4. Step 4: Simplify right side
    987.51x = 1,313,719.74
  5. Step 5: Solve for x
    x = 1,313,719.74/987.51
  6. Step 6: Final answer
    x = 1,330.34

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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.