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Finding the Fourth Proportional to 1,040.34, 1,435.53 and 636.77

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Solution

The fourth proportional to 1,040.34, 1,435.53 and 636.77 is: 878.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.34 : 1,435.53 = 636.77 : x
  2. Step 2: Convert to fraction form
    1,040.34/1,435.53 = 636.77/x
  3. Step 3: Cross multiply
    1,040.34x = 1,435.53 × 636.77
  4. Step 4: Simplify right side
    1,040.34x = 914,095.26
  5. Step 5: Solve for x
    x = 914,095.26/1,040.34
  6. Step 6: Final answer
    x = 878.65

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1.5x scale

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.