Home / 80,971.40-121,457.10-72,442.10

Finding the Fourth Proportional to 80,971.40, 121,457.10 and 72,442.10

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Solution

The fourth proportional to 80,971.40, 121,457.10 and 72,442.10 is: 108,663.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,971.40 : 121,457.10 = 72,442.10 : x
  2. Step 2: Convert to fraction form
    80,971.40/121,457.10 = 72,442.10/x
  3. Step 3: Cross multiply
    80,971.40x = 121,457.10 × 72,442.10
  4. Step 4: Simplify right side
    80,971.40x = 8,798,607,383.91
  5. Step 5: Solve for x
    x = 8,798,607,383.91/80,971.40
  6. Step 6: Final answer
    x = 108,663.15

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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.