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Finding the Fourth Proportional to 1,386.92, 1,913.70 and 889.80

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Solution

The fourth proportional to 1,386.92, 1,913.70 and 889.80 is: 1,227.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.92 : 1,913.70 = 889.80 : x
  2. Step 2: Convert to fraction form
    1,386.92/1,913.70 = 889.80/x
  3. Step 3: Cross multiply
    1,386.92x = 1,913.70 × 889.80
  4. Step 4: Simplify right side
    1,386.92x = 1,702,810.26
  5. Step 5: Solve for x
    x = 1,702,810.26/1,386.92
  6. Step 6: Final answer
    x = 1,227.76

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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.