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Finding the Fourth Proportional to 1,387.91, 2,078.51 and 1,341.74

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Solution

The fourth proportional to 1,387.91, 2,078.51 and 1,341.74 is: 2,009.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.91 : 2,078.51 = 1,341.74 : x
  2. Step 2: Convert to fraction form
    1,387.91/2,078.51 = 1,341.74/x
  3. Step 3: Cross multiply
    1,387.91x = 2,078.51 × 1,341.74
  4. Step 4: Simplify right side
    1,387.91x = 2,788,802.91
  5. Step 5: Solve for x
    x = 2,788,802.91/1,387.91
  6. Step 6: Final answer
    x = 2,009.36

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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.