Home / 158,435.55-218,639.79-86,815.40

Finding the Fourth Proportional to 158,435.55, 218,639.79 and 86,815.40

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Solution

The fourth proportional to 158,435.55, 218,639.79 and 86,815.40 is: 119,804.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,435.55 : 218,639.79 = 86,815.40 : x
  2. Step 2: Convert to fraction form
    158,435.55/218,639.79 = 86,815.40/x
  3. Step 3: Cross multiply
    158,435.55x = 218,639.79 × 86,815.40
  4. Step 4: Simplify right side
    158,435.55x = 18,981,299,731.57
  5. Step 5: Solve for x
    x = 18,981,299,731.57/158,435.55
  6. Step 6: Final answer
    x = 119,804.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.