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Finding the Fourth Proportional to 49,985.60, 74,978.40 and 45,903.20

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Solution

The fourth proportional to 49,985.60, 74,978.40 and 45,903.20 is: 68,854.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    49,985.60 : 74,978.40 = 45,903.20 : x
  2. Step 2: Convert to fraction form
    49,985.60/74,978.40 = 45,903.20/x
  3. Step 3: Cross multiply
    49,985.60x = 74,978.40 × 45,903.20
  4. Step 4: Simplify right side
    49,985.60x = 3,441,748,490.88
  5. Step 5: Solve for x
    x = 3,441,748,490.88/49,985.60
  6. Step 6: Final answer
    x = 68,854.80

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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.