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Finding the Fourth Proportional to 148,953.21, 205,543.21 and 87,689.67

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Solution

The fourth proportional to 148,953.21, 205,543.21 and 87,689.67 is: 121,004.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,953.21 : 205,543.21 = 87,689.67 : x
  2. Step 2: Convert to fraction form
    148,953.21/205,543.21 = 87,689.67/x
  3. Step 3: Cross multiply
    148,953.21x = 205,543.21 × 87,689.67
  4. Step 4: Simplify right side
    148,953.21x = 18,024,016,255.64
  5. Step 5: Solve for x
    x = 18,024,016,255.64/148,953.21
  6. Step 6: Final answer
    x = 121,004.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.