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Finding the Fourth Proportional to 840.37, 1,160.18 and 643.27

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Solution

The fourth proportional to 840.37, 1,160.18 and 643.27 is: 888.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.37 : 1,160.18 = 643.27 : x
  2. Step 2: Convert to fraction form
    840.37/1,160.18 = 643.27/x
  3. Step 3: Cross multiply
    840.37x = 1,160.18 × 643.27
  4. Step 4: Simplify right side
    840.37x = 746,305.77
  5. Step 5: Solve for x
    x = 746,305.77/840.37
  6. Step 6: Final answer
    x = 888.07

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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.