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Finding the Fourth Proportional to 154,490.88, 213,154.56 and 87,421.44

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Solution

The fourth proportional to 154,490.88, 213,154.56 and 87,421.44 is: 120,617.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,490.88 : 213,154.56 = 87,421.44 : x
  2. Step 2: Convert to fraction form
    154,490.88/213,154.56 = 87,421.44/x
  3. Step 3: Cross multiply
    154,490.88x = 213,154.56 × 87,421.44
  4. Step 4: Simplify right side
    154,490.88x = 18,634,278,577.77
  5. Step 5: Solve for x
    x = 18,634,278,577.77/154,490.88
  6. Step 6: Final answer
    x = 120,617.34

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1.5x scale

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.