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Finding the Fourth Proportional to 915.42, 1,263.36 and 561.42

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Solution

The fourth proportional to 915.42, 1,263.36 and 561.42 is: 774.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.42 : 1,263.36 = 561.42 : x
  2. Step 2: Convert to fraction form
    915.42/1,263.36 = 561.42/x
  3. Step 3: Cross multiply
    915.42x = 1,263.36 × 561.42
  4. Step 4: Simplify right side
    915.42x = 709,275.57
  5. Step 5: Solve for x
    x = 709,275.57/915.42
  6. Step 6: Final answer
    x = 774.81

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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.