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Finding the Fourth Proportional to 840.58, 1,159.99 and 486.54

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Solution

The fourth proportional to 840.58, 1,159.99 and 486.54 is: 671.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.58 : 1,159.99 = 486.54 : x
  2. Step 2: Convert to fraction form
    840.58/1,159.99 = 486.54/x
  3. Step 3: Cross multiply
    840.58x = 1,159.99 × 486.54
  4. Step 4: Simplify right side
    840.58x = 564,380.32
  5. Step 5: Solve for x
    x = 564,380.32/840.58
  6. Step 6: Final answer
    x = 671.42

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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.