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Finding the Fourth Proportional to 154,381.87, 212,979.36 and 90,690.94

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Solution

The fourth proportional to 154,381.87, 212,979.36 and 90,690.94 is: 125,113.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,381.87 : 212,979.36 = 90,690.94 : x
  2. Step 2: Convert to fraction form
    154,381.87/212,979.36 = 90,690.94/x
  3. Step 3: Cross multiply
    154,381.87x = 212,979.36 × 90,690.94
  4. Step 4: Simplify right side
    154,381.87x = 19,315,298,359.00
  5. Step 5: Solve for x
    x = 19,315,298,359.00/154,381.87
  6. Step 6: Final answer
    x = 125,113.77

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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.