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Finding the Fourth Proportional to 1,157.19, 1,739.54 and 928.58

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Solution

The fourth proportional to 1,157.19, 1,739.54 and 928.58 is: 1,395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.19 : 1,739.54 = 928.58 : x
  2. Step 2: Convert to fraction form
    1,157.19/1,739.54 = 928.58/x
  3. Step 3: Cross multiply
    1,157.19x = 1,739.54 × 928.58
  4. Step 4: Simplify right side
    1,157.19x = 1,615,302.05
  5. Step 5: Solve for x
    x = 1,615,302.05/1,157.19
  6. Step 6: Final answer
    x = 1,395.88

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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.