Home / 78,005.10-117,007.65-38,639.10

Finding the Fourth Proportional to 78,005.10, 117,007.65 and 38,639.10

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Solution

The fourth proportional to 78,005.10, 117,007.65 and 38,639.10 is: 57,958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,005.10 : 117,007.65 = 38,639.10 : x
  2. Step 2: Convert to fraction form
    78,005.10/117,007.65 = 38,639.10/x
  3. Step 3: Cross multiply
    78,005.10x = 117,007.65 × 38,639.10
  4. Step 4: Simplify right side
    78,005.10x = 4,521,070,289.12
  5. Step 5: Solve for x
    x = 4,521,070,289.12/78,005.10
  6. Step 6: Final answer
    x = 57,958.65

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1.5x scale

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.