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Finding the Fourth Proportional to 1,309.90, 1,807.86 and 786.02

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Solution

The fourth proportional to 1,309.90, 1,807.86 and 786.02 is: 1,084.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.90 : 1,807.86 = 786.02 : x
  2. Step 2: Convert to fraction form
    1,309.90/1,807.86 = 786.02/x
  3. Step 3: Cross multiply
    1,309.90x = 1,807.86 × 786.02
  4. Step 4: Simplify right side
    1,309.90x = 1,421,014.12
  5. Step 5: Solve for x
    x = 1,421,014.12/1,309.90
  6. Step 6: Final answer
    x = 1,084.83

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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.