Home / 420,956.72-631,430.28-121,427.42

Finding the Fourth Proportional to 420,956.72, 631,430.28 and 121,427.42

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Solution

The fourth proportional to 420,956.72, 631,430.28 and 121,427.42 is: 182,139.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,956.72 : 631,430.28 = 121,427.42 : x
  2. Step 2: Convert to fraction form
    420,956.72/631,430.28 = 121,427.42/x
  3. Step 3: Cross multiply
    420,956.72x = 631,430.28 × 121,427.42
  4. Step 4: Simplify right side
    420,956.72x = 76,672,949,810.28
  5. Step 5: Solve for x
    x = 76,672,949,810.28/420,956.72
  6. Step 6: Final answer
    x = 182,139.75

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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.