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Finding the Fourth Proportional to 840.66, 1,259.91 and 657.47

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Solution

The fourth proportional to 840.66, 1,259.91 and 657.47 is: 985.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.66 : 1,259.91 = 657.47 : x
  2. Step 2: Convert to fraction form
    840.66/1,259.91 = 657.47/x
  3. Step 3: Cross multiply
    840.66x = 1,259.91 × 657.47
  4. Step 4: Simplify right side
    840.66x = 828,346.73
  5. Step 5: Solve for x
    x = 828,346.73/840.66
  6. Step 6: Final answer
    x = 985.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.