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Finding the Fourth Proportional to 74,985.80, 112,521.90 and 28,272.20

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Solution

The fourth proportional to 74,985.80, 112,521.90 and 28,272.20 is: 42,424.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,985.80 : 112,521.90 = 28,272.20 : x
  2. Step 2: Convert to fraction form
    74,985.80/112,521.90 = 28,272.20/x
  3. Step 3: Cross multiply
    74,985.80x = 112,521.90 × 28,272.20
  4. Step 4: Simplify right side
    74,985.80x = 3,181,241,661.18
  5. Step 5: Solve for x
    x = 3,181,241,661.18/74,985.80
  6. Step 6: Final answer
    x = 42,424.59

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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.