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Finding the Fourth Proportional to 60,720.80, 91,081.20 and 56,784.20

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Solution

The fourth proportional to 60,720.80, 91,081.20 and 56,784.20 is: 85,176.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,720.80 : 91,081.20 = 56,784.20 : x
  2. Step 2: Convert to fraction form
    60,720.80/91,081.20 = 56,784.20/x
  3. Step 3: Cross multiply
    60,720.80x = 91,081.20 × 56,784.20
  4. Step 4: Simplify right side
    60,720.80x = 5,171,973,077.04
  5. Step 5: Solve for x
    x = 5,171,973,077.04/60,720.80
  6. Step 6: Final answer
    x = 85,176.30

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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.