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Finding the Fourth Proportional to 66,479.40, 99,719.10 and 42,859.80

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Solution

The fourth proportional to 66,479.40, 99,719.10 and 42,859.80 is: 64,289.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,479.40 : 99,719.10 = 42,859.80 : x
  2. Step 2: Convert to fraction form
    66,479.40/99,719.10 = 42,859.80/x
  3. Step 3: Cross multiply
    66,479.40x = 99,719.10 × 42,859.80
  4. Step 4: Simplify right side
    66,479.40x = 4,273,940,682.18
  5. Step 5: Solve for x
    x = 4,273,940,682.18/66,479.40
  6. Step 6: Final answer
    x = 64,289.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.