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Finding the Fourth Proportional to 39,978.79, 59,874.90 and 31,602.58

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Solution

The fourth proportional to 39,978.79, 59,874.90 and 31,602.58 is: 47,330.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.79 : 59,874.90 = 31,602.58 : x
  2. Step 2: Convert to fraction form
    39,978.79/59,874.90 = 31,602.58/x
  3. Step 3: Cross multiply
    39,978.79x = 59,874.90 × 31,602.58
  4. Step 4: Simplify right side
    39,978.79x = 1,892,201,317.24
  5. Step 5: Solve for x
    x = 1,892,201,317.24/39,978.79
  6. Step 6: Final answer
    x = 47,330.13

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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.