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Finding the Fourth Proportional to 1,159, 1,599.50 and 661.79

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Solution

The fourth proportional to 1,159, 1,599.50 and 661.79 is: 913.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159 : 1,599.50 = 661.79 : x
  2. Step 2: Convert to fraction form
    1,159/1,599.50 = 661.79/x
  3. Step 3: Cross multiply
    1,159x = 1,599.50 × 661.79
  4. Step 4: Simplify right side
    1,159x = 1,058,533.11
  5. Step 5: Solve for x
    x = 1,058,533.11/1,159
  6. Step 6: Final answer
    x = 913.32

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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.