Home / 213,639.40-320,490.98-78,693.19

Finding the Fourth Proportional to 213,639.40, 320,490.98 and 78,693.19

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Solution

The fourth proportional to 213,639.40, 320,490.98 and 78,693.19 is: 118,051.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,639.40 : 320,490.98 = 78,693.19 : x
  2. Step 2: Convert to fraction form
    213,639.40/320,490.98 = 78,693.19/x
  3. Step 3: Cross multiply
    213,639.40x = 320,490.98 × 78,693.19
  4. Step 4: Simplify right side
    213,639.40x = 25,220,457,582.43
  5. Step 5: Solve for x
    x = 25,220,457,582.43/213,639.40
  6. Step 6: Final answer
    x = 118,051.53

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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.