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Finding the Fourth Proportional to 915.51, 1,263.42 and 522.57

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Solution

The fourth proportional to 915.51, 1,263.42 and 522.57 is: 721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.51 : 1,263.42 = 522.57 : x
  2. Step 2: Convert to fraction form
    915.51/1,263.42 = 522.57/x
  3. Step 3: Cross multiply
    915.51x = 1,263.42 × 522.57
  4. Step 4: Simplify right side
    915.51x = 660,225.39
  5. Step 5: Solve for x
    x = 660,225.39/915.51
  6. Step 6: Final answer
    x = 721.16

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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.