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Finding the Fourth Proportional to 1,511.58, 2,085.71 and 913.90

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Solution

The fourth proportional to 1,511.58, 2,085.71 and 913.90 is: 1,261.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.58 : 2,085.71 = 913.90 : x
  2. Step 2: Convert to fraction form
    1,511.58/2,085.71 = 913.90/x
  3. Step 3: Cross multiply
    1,511.58x = 2,085.71 × 913.90
  4. Step 4: Simplify right side
    1,511.58x = 1,906,130.37
  5. Step 5: Solve for x
    x = 1,906,130.37/1,511.58
  6. Step 6: Final answer
    x = 1,261.02

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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.