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Finding the Fourth Proportional to 93,720.76, 129,321.90 and 55,987

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Solution

The fourth proportional to 93,720.76, 129,321.90 and 55,987 is: 77,254.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,720.76 : 129,321.90 = 55,987 : x
  2. Step 2: Convert to fraction form
    93,720.76/129,321.90 = 55,987/x
  3. Step 3: Cross multiply
    93,720.76x = 129,321.90 × 55,987
  4. Step 4: Simplify right side
    93,720.76x = 7,240,345,215.30
  5. Step 5: Solve for x
    x = 7,240,345,215.30/93,720.76
  6. Step 6: Final answer
    x = 77,254.44

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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.