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Finding the Fourth Proportional to 915.18, 1,262.95 and 561.10

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Solution

The fourth proportional to 915.18, 1,262.95 and 561.10 is: 774.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.18 : 1,262.95 = 561.10 : x
  2. Step 2: Convert to fraction form
    915.18/1,262.95 = 561.10/x
  3. Step 3: Cross multiply
    915.18x = 1,262.95 × 561.10
  4. Step 4: Simplify right side
    915.18x = 708,632.12
  5. Step 5: Solve for x
    x = 708,632.12/915.18
  6. Step 6: Final answer
    x = 774.31

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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.