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Finding the Fourth Proportional to 198,030.76, 297,123.90 and 87,145

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Solution

The fourth proportional to 198,030.76, 297,123.90 and 87,145 is: 130,751.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,030.76 : 297,123.90 = 87,145 : x
  2. Step 2: Convert to fraction form
    198,030.76/297,123.90 = 87,145/x
  3. Step 3: Cross multiply
    198,030.76x = 297,123.90 × 87,145
  4. Step 4: Simplify right side
    198,030.76x = 25,892,862,265.50
  5. Step 5: Solve for x
    x = 25,892,862,265.50/198,030.76
  6. Step 6: Final answer
    x = 130,751.72

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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.