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Finding the Fourth Proportional to 72,878.70, 100,579.76 and 42,662.20

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Solution

The fourth proportional to 72,878.70, 100,579.76 and 42,662.20 is: 58,878.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,878.70 : 100,579.76 = 42,662.20 : x
  2. Step 2: Convert to fraction form
    72,878.70/100,579.76 = 42,662.20/x
  3. Step 3: Cross multiply
    72,878.70x = 100,579.76 × 42,662.20
  4. Step 4: Simplify right side
    72,878.70x = 4,290,953,837.07
  5. Step 5: Solve for x
    x = 4,290,953,837.07/72,878.70
  6. Step 6: Final answer
    x = 58,878.02

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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.