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Finding the Fourth Proportional to 1,340.65, 2,008.36 and 783.95

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Solution

The fourth proportional to 1,340.65, 2,008.36 and 783.95 is: 1,174.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.65 : 2,008.36 = 783.95 : x
  2. Step 2: Convert to fraction form
    1,340.65/2,008.36 = 783.95/x
  3. Step 3: Cross multiply
    1,340.65x = 2,008.36 × 783.95
  4. Step 4: Simplify right side
    1,340.65x = 1,574,444.76
  5. Step 5: Solve for x
    x = 1,574,444.76/1,340.65
  6. Step 6: Final answer
    x = 1,174.39

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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.