Home / 100,563.45-138,737.88-64,774.21

Finding the Fourth Proportional to 100,563.45, 138,737.88 and 64,774.21

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Solution

The fourth proportional to 100,563.45, 138,737.88 and 64,774.21 is: 89,362.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,563.45 : 138,737.88 = 64,774.21 : x
  2. Step 2: Convert to fraction form
    100,563.45/138,737.88 = 64,774.21/x
  3. Step 3: Cross multiply
    100,563.45x = 138,737.88 × 64,774.21
  4. Step 4: Simplify right side
    100,563.45x = 8,986,636,574.07
  5. Step 5: Solve for x
    x = 8,986,636,574.07/100,563.45
  6. Step 6: Final answer
    x = 89,362.85

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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.