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Finding the Fourth Proportional to 840.38, 1,259.35 and 475.07

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Solution

The fourth proportional to 840.38, 1,259.35 and 475.07 is: 711.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.38 : 1,259.35 = 475.07 : x
  2. Step 2: Convert to fraction form
    840.38/1,259.35 = 475.07/x
  3. Step 3: Cross multiply
    840.38x = 1,259.35 × 475.07
  4. Step 4: Simplify right side
    840.38x = 598,271.92
  5. Step 5: Solve for x
    x = 598,271.92/840.38
  6. Step 6: Final answer
    x = 711.91

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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.