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Finding the Fourth Proportional to 915.06, 1,263.42 and 620.58

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Solution

The fourth proportional to 915.06, 1,263.42 and 620.58 is: 856.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.06 : 1,263.42 = 620.58 : x
  2. Step 2: Convert to fraction form
    915.06/1,263.42 = 620.58/x
  3. Step 3: Cross multiply
    915.06x = 1,263.42 × 620.58
  4. Step 4: Simplify right side
    915.06x = 784,053.18
  5. Step 5: Solve for x
    x = 784,053.18/915.06
  6. Step 6: Final answer
    x = 856.83

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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.