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Finding the Fourth Proportional to 1,129.68, 1,558.93 and 657.85

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Solution

The fourth proportional to 1,129.68, 1,558.93 and 657.85 is: 907.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.68 : 1,558.93 = 657.85 : x
  2. Step 2: Convert to fraction form
    1,129.68/1,558.93 = 657.85/x
  3. Step 3: Cross multiply
    1,129.68x = 1,558.93 × 657.85
  4. Step 4: Simplify right side
    1,129.68x = 1,025,538.81
  5. Step 5: Solve for x
    x = 1,025,538.81/1,129.68
  6. Step 6: Final answer
    x = 907.82

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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.