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Finding the Fourth Proportional to 154,353.42, 212,967.90 and 90,678.78

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Solution

The fourth proportional to 154,353.42, 212,967.90 and 90,678.78 is: 125,113.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,353.42 : 212,967.90 = 90,678.78 : x
  2. Step 2: Convert to fraction form
    154,353.42/212,967.90 = 90,678.78/x
  3. Step 3: Cross multiply
    154,353.42x = 212,967.90 × 90,678.78
  4. Step 4: Simplify right side
    154,353.42x = 19,311,669,351.16
  5. Step 5: Solve for x
    x = 19,311,669,351.16/154,353.42
  6. Step 6: Final answer
    x = 125,113.32

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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.