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Finding the Fourth Proportional to 915.84, 1,263.57 and 561.39

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Solution

The fourth proportional to 915.84, 1,263.57 and 561.39 is: 774.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.84 : 1,263.57 = 561.39 : x
  2. Step 2: Convert to fraction form
    915.84/1,263.57 = 561.39/x
  3. Step 3: Cross multiply
    915.84x = 1,263.57 × 561.39
  4. Step 4: Simplify right side
    915.84x = 709,352.76
  5. Step 5: Solve for x
    x = 709,352.76/915.84
  6. Step 6: Final answer
    x = 774.54

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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.