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Finding the Fourth Proportional to 405,312.76, 607,981.50 and 139,069.56

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Solution

The fourth proportional to 405,312.76, 607,981.50 and 139,069.56 is: 208,608.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,312.76 : 607,981.50 = 139,069.56 : x
  2. Step 2: Convert to fraction form
    405,312.76/607,981.50 = 139,069.56/x
  3. Step 3: Cross multiply
    405,312.76x = 607,981.50 × 139,069.56
  4. Step 4: Simplify right side
    405,312.76x = 84,551,719,693.14
  5. Step 5: Solve for x
    x = 84,551,719,693.14/405,312.76
  6. Step 6: Final answer
    x = 208,608.58

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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.