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Finding the Fourth Proportional to 1,345, 1,855.86 and 785.32

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Solution

The fourth proportional to 1,345, 1,855.86 and 785.32 is: 1,083.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345 : 1,855.86 = 785.32 : x
  2. Step 2: Convert to fraction form
    1,345/1,855.86 = 785.32/x
  3. Step 3: Cross multiply
    1,345x = 1,855.86 × 785.32
  4. Step 4: Simplify right side
    1,345x = 1,457,443.98
  5. Step 5: Solve for x
    x = 1,457,443.98/1,345
  6. Step 6: Final answer
    x = 1,083.60

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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.