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Finding the Fourth Proportional to 81,688.58, 112,730.26 and 45,878.64

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Solution

The fourth proportional to 81,688.58, 112,730.26 and 45,878.64 is: 63,312.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,688.58 : 112,730.26 = 45,878.64 : x
  2. Step 2: Convert to fraction form
    81,688.58/112,730.26 = 45,878.64/x
  3. Step 3: Cross multiply
    81,688.58x = 112,730.26 × 45,878.64
  4. Step 4: Simplify right side
    81,688.58x = 5,171,911,015.65
  5. Step 5: Solve for x
    x = 5,171,911,015.65/81,688.58
  6. Step 6: Final answer
    x = 63,312.53

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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.