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Finding the Fourth Proportional to 78,319.90, 117,479.85 and 38,953.90

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Solution

The fourth proportional to 78,319.90, 117,479.85 and 38,953.90 is: 58,430.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,319.90 : 117,479.85 = 38,953.90 : x
  2. Step 2: Convert to fraction form
    78,319.90/117,479.85 = 38,953.90/x
  3. Step 3: Cross multiply
    78,319.90x = 117,479.85 × 38,953.90
  4. Step 4: Simplify right side
    78,319.90x = 4,576,298,328.92
  5. Step 5: Solve for x
    x = 4,576,298,328.92/78,319.90
  6. Step 6: Final answer
    x = 58,430.85

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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.