Home / 78,345.85-117,565.46-28,429.84

Finding the Fourth Proportional to 78,345.85, 117,565.46 and 28,429.84

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Solution

The fourth proportional to 78,345.85, 117,565.46 and 28,429.84 is: 42,661.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,345.85 : 117,565.46 = 28,429.84 : x
  2. Step 2: Convert to fraction form
    78,345.85/117,565.46 = 28,429.84/x
  3. Step 3: Cross multiply
    78,345.85x = 117,565.46 × 28,429.84
  4. Step 4: Simplify right side
    78,345.85x = 3,342,366,787.38
  5. Step 5: Solve for x
    x = 3,342,366,787.38/78,345.85
  6. Step 6: Final answer
    x = 42,661.70

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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.