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Finding the Fourth Proportional to 154,440, 213,127.20 and 87,372

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Solution

The fourth proportional to 154,440, 213,127.20 and 87,372 is: 120,573.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,440 : 213,127.20 = 87,372 : x
  2. Step 2: Convert to fraction form
    154,440/213,127.20 = 87,372/x
  3. Step 3: Cross multiply
    154,440x = 213,127.20 × 87,372
  4. Step 4: Simplify right side
    154,440x = 18,621,349,718.40
  5. Step 5: Solve for x
    x = 18,621,349,718.40/154,440
  6. Step 6: Final answer
    x = 120,573.36

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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.