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Finding the Fourth Proportional to 912.08, 1,368.50 and 619.92

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Solution

The fourth proportional to 912.08, 1,368.50 and 619.92 is: 930.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.08 : 1,368.50 = 619.92 : x
  2. Step 2: Convert to fraction form
    912.08/1,368.50 = 619.92/x
  3. Step 3: Cross multiply
    912.08x = 1,368.50 × 619.92
  4. Step 4: Simplify right side
    912.08x = 848,357.42
  5. Step 5: Solve for x
    x = 848,357.42/912.08
  6. Step 6: Final answer
    x = 930.14

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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.