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Finding the Fourth Proportional to 1,386.71, 1,913.18 and 826.80

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Solution

The fourth proportional to 1,386.71, 1,913.18 and 826.80 is: 1,140.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.71 : 1,913.18 = 826.80 : x
  2. Step 2: Convert to fraction form
    1,386.71/1,913.18 = 826.80/x
  3. Step 3: Cross multiply
    1,386.71x = 1,913.18 × 826.80
  4. Step 4: Simplify right side
    1,386.71x = 1,581,807.66
  5. Step 5: Solve for x
    x = 1,581,807.66/1,386.71
  6. Step 6: Final answer
    x = 1,140.69

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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.