Home / 81,001.40-121,502.10-78,814.40

Finding the Fourth Proportional to 81,001.40, 121,502.10 and 78,814.40

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Solution

The fourth proportional to 81,001.40, 121,502.10 and 78,814.40 is: 118,221.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,001.40 : 121,502.10 = 78,814.40 : x
  2. Step 2: Convert to fraction form
    81,001.40/121,502.10 = 78,814.40/x
  3. Step 3: Cross multiply
    81,001.40x = 121,502.10 × 78,814.40
  4. Step 4: Simplify right side
    81,001.40x = 9,576,115,110.24
  5. Step 5: Solve for x
    x = 9,576,115,110.24/81,001.40
  6. Step 6: Final answer
    x = 118,221.60

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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.