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Finding the Fourth Proportional to 421,317.40, 631,913.91 and 155,015.98

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Solution

The fourth proportional to 421,317.40, 631,913.91 and 155,015.98 is: 232,501.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,317.40 : 631,913.91 = 155,015.98 : x
  2. Step 2: Convert to fraction form
    421,317.40/631,913.91 = 155,015.98/x
  3. Step 3: Cross multiply
    421,317.40x = 631,913.91 × 155,015.98
  4. Step 4: Simplify right side
    421,317.40x = 97,956,751,873.19
  5. Step 5: Solve for x
    x = 97,956,751,873.19/421,317.40
  6. Step 6: Final answer
    x = 232,501.08

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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.