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Finding the Fourth Proportional to 405,068.80, 607,603.20 and 138,831.93

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Solution

The fourth proportional to 405,068.80, 607,603.20 and 138,831.93 is: 208,247.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,068.80 : 607,603.20 = 138,831.93 : x
  2. Step 2: Convert to fraction form
    405,068.80/607,603.20 = 138,831.93/x
  3. Step 3: Cross multiply
    405,068.80x = 607,603.20 × 138,831.93
  4. Step 4: Simplify right side
    405,068.80x = 84,354,724,930.18
  5. Step 5: Solve for x
    x = 84,354,724,930.18/405,068.80
  6. Step 6: Final answer
    x = 208,247.90

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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.