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Finding the Fourth Proportional to 1,377, 1,899.54 and 878.76

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Solution

The fourth proportional to 1,377, 1,899.54 and 878.76 is: 1,212.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377 : 1,899.54 = 878.76 : x
  2. Step 2: Convert to fraction form
    1,377/1,899.54 = 878.76/x
  3. Step 3: Cross multiply
    1,377x = 1,899.54 × 878.76
  4. Step 4: Simplify right side
    1,377x = 1,669,239.77
  5. Step 5: Solve for x
    x = 1,669,239.77/1,377
  6. Step 6: Final answer
    x = 1,212.23

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Double scale
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1.5x scale

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.