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Finding the Fourth Proportional to 81,712.60, 112,776.51 and 76,376.32

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Solution

The fourth proportional to 81,712.60, 112,776.51 and 76,376.32 is: 105,411.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,712.60 : 112,776.51 = 76,376.32 : x
  2. Step 2: Convert to fraction form
    81,712.60/112,776.51 = 76,376.32/x
  3. Step 3: Cross multiply
    81,712.60x = 112,776.51 × 76,376.32
  4. Step 4: Simplify right side
    81,712.60x = 8,613,454,816.24
  5. Step 5: Solve for x
    x = 8,613,454,816.24/81,712.60
  6. Step 6: Final answer
    x = 105,411.59

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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.