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Finding the Fourth Proportional to 1,386.61, 1,912.87 and 826.76

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Solution

The fourth proportional to 1,386.61, 1,912.87 and 826.76 is: 1,140.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.61 : 1,912.87 = 826.76 : x
  2. Step 2: Convert to fraction form
    1,386.61/1,912.87 = 826.76/x
  3. Step 3: Cross multiply
    1,386.61x = 1,912.87 × 826.76
  4. Step 4: Simplify right side
    1,386.61x = 1,581,484.40
  5. Step 5: Solve for x
    x = 1,581,484.40/1,386.61
  6. Step 6: Final answer
    x = 1,140.54

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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.