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Finding the Fourth Proportional to 64,705.80, 89,342.66 and 63,672.45

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Solution

The fourth proportional to 64,705.80, 89,342.66 and 63,672.45 is: 87,915.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,705.80 : 89,342.66 = 63,672.45 : x
  2. Step 2: Convert to fraction form
    64,705.80/89,342.66 = 63,672.45/x
  3. Step 3: Cross multiply
    64,705.80x = 89,342.66 × 63,672.45
  4. Step 4: Simplify right side
    64,705.80x = 5,688,665,733.35
  5. Step 5: Solve for x
    x = 5,688,665,733.35/64,705.80
  6. Step 6: Final answer
    x = 87,915.86

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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.