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Finding the Fourth Proportional to 39,807.60, 59,639.40 and 18,985.20

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Solution

The fourth proportional to 39,807.60, 59,639.40 and 18,985.20 is: 28,443.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,807.60 : 59,639.40 = 18,985.20 : x
  2. Step 2: Convert to fraction form
    39,807.60/59,639.40 = 18,985.20/x
  3. Step 3: Cross multiply
    39,807.60x = 59,639.40 × 18,985.20
  4. Step 4: Simplify right side
    39,807.60x = 1,132,265,936.88
  5. Step 5: Solve for x
    x = 1,132,265,936.88/39,807.60
  6. Step 6: Final answer
    x = 28,443.46

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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.