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Finding the Fourth Proportional to 865.83, 1,298.75 and 403.46

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Solution

The fourth proportional to 865.83, 1,298.75 and 403.46 is: 605.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.83 : 1,298.75 = 403.46 : x
  2. Step 2: Convert to fraction form
    865.83/1,298.75 = 403.46/x
  3. Step 3: Cross multiply
    865.83x = 1,298.75 × 403.46
  4. Step 4: Simplify right side
    865.83x = 523,985.16
  5. Step 5: Solve for x
    x = 523,985.16/865.83
  6. Step 6: Final answer
    x = 605.18

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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.