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Finding the Fourth Proportional to 78,720.96, 108,630.90 and 42,907.44

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Solution

The fourth proportional to 78,720.96, 108,630.90 and 42,907.44 is: 59,210.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.96 : 108,630.90 = 42,907.44 : x
  2. Step 2: Convert to fraction form
    78,720.96/108,630.90 = 42,907.44/x
  3. Step 3: Cross multiply
    78,720.96x = 108,630.90 × 42,907.44
  4. Step 4: Simplify right side
    78,720.96x = 4,661,073,823.90
  5. Step 5: Solve for x
    x = 4,661,073,823.90/78,720.96
  6. Step 6: Final answer
    x = 59,210.07

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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.