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Finding the Fourth Proportional to 835.87, 1,154.60 and 641.77

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Solution

The fourth proportional to 835.87, 1,154.60 and 641.77 is: 886.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.87 : 1,154.60 = 641.77 : x
  2. Step 2: Convert to fraction form
    835.87/1,154.60 = 641.77/x
  3. Step 3: Cross multiply
    835.87x = 1,154.60 × 641.77
  4. Step 4: Simplify right side
    835.87x = 740,987.64
  5. Step 5: Solve for x
    x = 740,987.64/835.87
  6. Step 6: Final answer
    x = 886.49

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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.