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Finding the Fourth Proportional to 1,159.64, 1,739.75 and 638.93

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Solution

The fourth proportional to 1,159.64, 1,739.75 and 638.93 is: 958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.64 : 1,739.75 = 638.93 : x
  2. Step 2: Convert to fraction form
    1,159.64/1,739.75 = 638.93/x
  3. Step 3: Cross multiply
    1,159.64x = 1,739.75 × 638.93
  4. Step 4: Simplify right side
    1,159.64x = 1,111,578.79
  5. Step 5: Solve for x
    x = 1,111,578.79/1,159.64
  6. Step 6: Final answer
    x = 958.55

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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.