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Finding the Fourth Proportional to 1,345.15, 1,855.75 and 847.51

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Solution

The fourth proportional to 1,345.15, 1,855.75 and 847.51 is: 1,169.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.15 : 1,855.75 = 847.51 : x
  2. Step 2: Convert to fraction form
    1,345.15/1,855.75 = 847.51/x
  3. Step 3: Cross multiply
    1,345.15x = 1,855.75 × 847.51
  4. Step 4: Simplify right side
    1,345.15x = 1,572,766.68
  5. Step 5: Solve for x
    x = 1,572,766.68/1,345.15
  6. Step 6: Final answer
    x = 1,169.21

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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.