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Finding the Fourth Proportional to 1,159.79, 1,739.88 and 612.43

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Solution

The fourth proportional to 1,159.79, 1,739.88 and 612.43 is: 918.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.79 : 1,739.88 = 612.43 : x
  2. Step 2: Convert to fraction form
    1,159.79/1,739.88 = 612.43/x
  3. Step 3: Cross multiply
    1,159.79x = 1,739.88 × 612.43
  4. Step 4: Simplify right side
    1,159.79x = 1,065,550.36
  5. Step 5: Solve for x
    x = 1,065,550.36/1,159.79
  6. Step 6: Final answer
    x = 918.75

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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.