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Finding the Fourth Proportional to 42,803.40, 64,205.10 and 28,806.60

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Solution

The fourth proportional to 42,803.40, 64,205.10 and 28,806.60 is: 43,209.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,803.40 : 64,205.10 = 28,806.60 : x
  2. Step 2: Convert to fraction form
    42,803.40/64,205.10 = 28,806.60/x
  3. Step 3: Cross multiply
    42,803.40x = 64,205.10 × 28,806.60
  4. Step 4: Simplify right side
    42,803.40x = 1,849,530,633.66
  5. Step 5: Solve for x
    x = 1,849,530,633.66/42,803.40
  6. Step 6: Final answer
    x = 43,209.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.