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Finding the Fourth Proportional to 915.44, 1,260.70 and 653.00

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Solution

The fourth proportional to 915.44, 1,260.70 and 653.00 is: 899.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.44 : 1,260.70 = 653.00 : x
  2. Step 2: Convert to fraction form
    915.44/1,260.70 = 653.00/x
  3. Step 3: Cross multiply
    915.44x = 1,260.70 × 653.00
  4. Step 4: Simplify right side
    915.44x = 823,229.16
  5. Step 5: Solve for x
    x = 823,229.16/915.44
  6. Step 6: Final answer
    x = 899.28

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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.