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Finding the Fourth Proportional to 66,415.68, 99,623.21 and 28,459.40

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Solution

The fourth proportional to 66,415.68, 99,623.21 and 28,459.40 is: 42,688.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,415.68 : 99,623.21 = 28,459.40 : x
  2. Step 2: Convert to fraction form
    66,415.68/99,623.21 = 28,459.40/x
  3. Step 3: Cross multiply
    66,415.68x = 99,623.21 × 28,459.40
  4. Step 4: Simplify right side
    66,415.68x = 2,835,216,142.26
  5. Step 5: Solve for x
    x = 2,835,216,142.26/66,415.68
  6. Step 6: Final answer
    x = 42,688.96

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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.