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Finding the Fourth Proportional to 78,709.80, 118,064.70 and 43,280.40

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Solution

The fourth proportional to 78,709.80, 118,064.70 and 43,280.40 is: 64,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,709.80 : 118,064.70 = 43,280.40 : x
  2. Step 2: Convert to fraction form
    78,709.80/118,064.70 = 43,280.40/x
  3. Step 3: Cross multiply
    78,709.80x = 118,064.70 × 43,280.40
  4. Step 4: Simplify right side
    78,709.80x = 5,109,887,441.88
  5. Step 5: Solve for x
    x = 5,109,887,441.88/78,709.80
  6. Step 6: Final answer
    x = 64,920.60

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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.