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Finding the Fourth Proportional to 1,042.72, 1,564 and 312.24

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Solution

The fourth proportional to 1,042.72, 1,564 and 312.24 is: 468.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.72 : 1,564 = 312.24 : x
  2. Step 2: Convert to fraction form
    1,042.72/1,564 = 312.24/x
  3. Step 3: Cross multiply
    1,042.72x = 1,564 × 312.24
  4. Step 4: Simplify right side
    1,042.72x = 488,343.36
  5. Step 5: Solve for x
    x = 488,343.36/1,042.72
  6. Step 6: Final answer
    x = 468.34

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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.