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Finding the Fourth Proportional to 631,425.96, 871,211.70 and 405,377.64

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Solution

The fourth proportional to 631,425.96, 871,211.70 and 405,377.64 is: 559,320.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,425.96 : 871,211.70 = 405,377.64 : x
  2. Step 2: Convert to fraction form
    631,425.96/871,211.70 = 405,377.64/x
  3. Step 3: Cross multiply
    631,425.96x = 871,211.70 × 405,377.64
  4. Step 4: Simplify right side
    631,425.96x = 353,169,742,886.39
  5. Step 5: Solve for x
    x = 353,169,742,886.39/631,425.96
  6. Step 6: Final answer
    x = 559,320.91

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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.