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Finding the Fourth Proportional to 915.17, 1,365.28 and 890.06

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Solution

The fourth proportional to 915.17, 1,365.28 and 890.06 is: 1,327.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.17 : 1,365.28 = 890.06 : x
  2. Step 2: Convert to fraction form
    915.17/1,365.28 = 890.06/x
  3. Step 3: Cross multiply
    915.17x = 1,365.28 × 890.06
  4. Step 4: Simplify right side
    915.17x = 1,215,172.07
  5. Step 5: Solve for x
    x = 1,215,172.07/915.17
  6. Step 6: Final answer
    x = 1,327.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.