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Finding the Fourth Proportional to 100,611.12, 138,803.58 and 64,822.02

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Solution

The fourth proportional to 100,611.12, 138,803.58 and 64,822.02 is: 89,428.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,611.12 : 138,803.58 = 64,822.02 : x
  2. Step 2: Convert to fraction form
    100,611.12/138,803.58 = 64,822.02/x
  3. Step 3: Cross multiply
    100,611.12x = 138,803.58 × 64,822.02
  4. Step 4: Simplify right side
    100,611.12x = 8,997,528,438.83
  5. Step 5: Solve for x
    x = 8,997,528,438.83/100,611.12
  6. Step 6: Final answer
    x = 89,428.77

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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.