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Finding the Fourth Proportional to 405,298.75, 607,960.47 and 139,055.53

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Solution

The fourth proportional to 405,298.75, 607,960.47 and 139,055.53 is: 208,587.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,298.75 : 607,960.47 = 139,055.53 : x
  2. Step 2: Convert to fraction form
    405,298.75/607,960.47 = 139,055.53/x
  3. Step 3: Cross multiply
    405,298.75x = 607,960.47 × 139,055.53
  4. Step 4: Simplify right side
    405,298.75x = 84,540,265,374.90
  5. Step 5: Solve for x
    x = 84,540,265,374.90/405,298.75
  6. Step 6: Final answer
    x = 208,587.53

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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.