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Finding the Fourth Proportional to 78,318.90, 108,079.72 and 42,508.60

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Solution

The fourth proportional to 78,318.90, 108,079.72 and 42,508.60 is: 58,661.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,318.90 : 108,079.72 = 42,508.60 : x
  2. Step 2: Convert to fraction form
    78,318.90/108,079.72 = 42,508.60/x
  3. Step 3: Cross multiply
    78,318.90x = 108,079.72 × 42,508.60
  4. Step 4: Simplify right side
    78,318.90x = 4,594,317,209.12
  5. Step 5: Solve for x
    x = 4,594,317,209.12/78,318.90
  6. Step 6: Final answer
    x = 58,661.67

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1.5x scale

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.