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Finding the Fourth Proportional to 74,686.70, 112,030.05 and 66,521.90

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Solution

The fourth proportional to 74,686.70, 112,030.05 and 66,521.90 is: 99,782.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,686.70 : 112,030.05 = 66,521.90 : x
  2. Step 2: Convert to fraction form
    74,686.70/112,030.05 = 66,521.90/x
  3. Step 3: Cross multiply
    74,686.70x = 112,030.05 × 66,521.90
  4. Step 4: Simplify right side
    74,686.70x = 7,452,451,783.10
  5. Step 5: Solve for x
    x = 7,452,451,783.10/74,686.70
  6. Step 6: Final answer
    x = 99,782.85

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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.