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Finding the Fourth Proportional to 1,129.90, 1,559.58 and 657.90

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Solution

The fourth proportional to 1,129.90, 1,559.58 and 657.90 is: 908.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.90 : 1,559.58 = 657.90 : x
  2. Step 2: Convert to fraction form
    1,129.90/1,559.58 = 657.90/x
  3. Step 3: Cross multiply
    1,129.90x = 1,559.58 × 657.90
  4. Step 4: Simplify right side
    1,129.90x = 1,026,047.68
  5. Step 5: Solve for x
    x = 1,026,047.68/1,129.90
  6. Step 6: Final answer
    x = 908.09

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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.