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Finding the Fourth Proportional to 1,042.67, 1,564.00 and 312.26

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Solution

The fourth proportional to 1,042.67, 1,564.00 and 312.26 is: 468.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.67 : 1,564.00 = 312.26 : x
  2. Step 2: Convert to fraction form
    1,042.67/1,564.00 = 312.26/x
  3. Step 3: Cross multiply
    1,042.67x = 1,564.00 × 312.26
  4. Step 4: Simplify right side
    1,042.67x = 488,366.04
  5. Step 5: Solve for x
    x = 488,366.04/1,042.67
  6. Step 6: Final answer
    x = 468.38

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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.