Home / 87,830.10-121,275.40-81,113.26

Finding the Fourth Proportional to 87,830.10, 121,275.40 and 81,113.26

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Solution

The fourth proportional to 87,830.10, 121,275.40 and 81,113.26 is: 112,000.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,830.10 : 121,275.40 = 81,113.26 : x
  2. Step 2: Convert to fraction form
    87,830.10/121,275.40 = 81,113.26/x
  3. Step 3: Cross multiply
    87,830.10x = 121,275.40 × 81,113.26
  4. Step 4: Simplify right side
    87,830.10x = 9,837,043,051.80
  5. Step 5: Solve for x
    x = 9,837,043,051.80/87,830.10
  6. Step 6: Final answer
    x = 112,000.82

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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.