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Finding the Fourth Proportional to 1,395.16, 1,925.30 and 805.68

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Solution

The fourth proportional to 1,395.16, 1,925.30 and 805.68 is: 1,111.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.16 : 1,925.30 = 805.68 : x
  2. Step 2: Convert to fraction form
    1,395.16/1,925.30 = 805.68/x
  3. Step 3: Cross multiply
    1,395.16x = 1,925.30 × 805.68
  4. Step 4: Simplify right side
    1,395.16x = 1,551,177.72
  5. Step 5: Solve for x
    x = 1,551,177.72/1,395.16
  6. Step 6: Final answer
    x = 1,111.83

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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.