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Finding the Fourth Proportional to 915.83, 1,263.86 and 543

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Solution

The fourth proportional to 915.83, 1,263.86 and 543 is: 749.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.83 : 1,263.86 = 543 : x
  2. Step 2: Convert to fraction form
    915.83/1,263.86 = 543/x
  3. Step 3: Cross multiply
    915.83x = 1,263.86 × 543
  4. Step 4: Simplify right side
    915.83x = 686,273.27
  5. Step 5: Solve for x
    x = 686,273.27/915.83
  6. Step 6: Final answer
    x = 749.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.