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Finding the Fourth Proportional to 910.55, 1,256.37 and 561.17

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Solution

The fourth proportional to 910.55, 1,256.37 and 561.17 is: 774.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.55 : 1,256.37 = 561.17 : x
  2. Step 2: Convert to fraction form
    910.55/1,256.37 = 561.17/x
  3. Step 3: Cross multiply
    910.55x = 1,256.37 × 561.17
  4. Step 4: Simplify right side
    910.55x = 705,037.15
  5. Step 5: Solve for x
    x = 705,037.15/910.55
  6. Step 6: Final answer
    x = 774.30

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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.