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Finding the Fourth Proportional to 1,264.28, 1,894.62 and 715.31

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Solution

The fourth proportional to 1,264.28, 1,894.62 and 715.31 is: 1,071.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.28 : 1,894.62 = 715.31 : x
  2. Step 2: Convert to fraction form
    1,264.28/1,894.62 = 715.31/x
  3. Step 3: Cross multiply
    1,264.28x = 1,894.62 × 715.31
  4. Step 4: Simplify right side
    1,264.28x = 1,355,240.63
  5. Step 5: Solve for x
    x = 1,355,240.63/1,264.28
  6. Step 6: Final answer
    x = 1,071.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.