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Finding the Fourth Proportional to 290,810.40, 436,215.58 and 80,442.86

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Solution

The fourth proportional to 290,810.40, 436,215.58 and 80,442.86 is: 120,664.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,810.40 : 436,215.58 = 80,442.86 : x
  2. Step 2: Convert to fraction form
    290,810.40/436,215.58 = 80,442.86/x
  3. Step 3: Cross multiply
    290,810.40x = 436,215.58 × 80,442.86
  4. Step 4: Simplify right side
    290,810.40x = 35,090,428,831.76
  5. Step 5: Solve for x
    x = 35,090,428,831.76/290,810.40
  6. Step 6: Final answer
    x = 120,664.28

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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.