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Finding the Fourth Proportional to 1,042.82, 1,564.22 and 312.50

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Solution

The fourth proportional to 1,042.82, 1,564.22 and 312.50 is: 468.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.82 : 1,564.22 = 312.50 : x
  2. Step 2: Convert to fraction form
    1,042.82/1,564.22 = 312.50/x
  3. Step 3: Cross multiply
    1,042.82x = 1,564.22 × 312.50
  4. Step 4: Simplify right side
    1,042.82x = 488,823.44
  5. Step 5: Solve for x
    x = 488,823.44/1,042.82
  6. Step 6: Final answer
    x = 468.75

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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.