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Finding the Fourth Proportional to 1,278.96, 1,921.17 and 916.08

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Solution

The fourth proportional to 1,278.96, 1,921.17 and 916.08 is: 1,376.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.96 : 1,921.17 = 916.08 : x
  2. Step 2: Convert to fraction form
    1,278.96/1,921.17 = 916.08/x
  3. Step 3: Cross multiply
    1,278.96x = 1,921.17 × 916.08
  4. Step 4: Simplify right side
    1,278.96x = 1,759,945.41
  5. Step 5: Solve for x
    x = 1,759,945.41/1,278.96
  6. Step 6: Final answer
    x = 1,376.08

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1.5x scale

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.