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Finding the Fourth Proportional to 934.63, 1,395.15 and 857.59

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Solution

The fourth proportional to 934.63, 1,395.15 and 857.59 is: 1,280.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.63 : 1,395.15 = 857.59 : x
  2. Step 2: Convert to fraction form
    934.63/1,395.15 = 857.59/x
  3. Step 3: Cross multiply
    934.63x = 1,395.15 × 857.59
  4. Step 4: Simplify right side
    934.63x = 1,196,466.69
  5. Step 5: Solve for x
    x = 1,196,466.69/934.63
  6. Step 6: Final answer
    x = 1,280.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.