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Finding the Fourth Proportional to 280,303.21, 420,521.78 and 90,763.78

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Solution

The fourth proportional to 280,303.21, 420,521.78 and 90,763.78 is: 136,167.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,303.21 : 420,521.78 = 90,763.78 : x
  2. Step 2: Convert to fraction form
    280,303.21/420,521.78 = 90,763.78/x
  3. Step 3: Cross multiply
    280,303.21x = 420,521.78 × 90,763.78
  4. Step 4: Simplify right side
    280,303.21x = 38,168,143,768.70
  5. Step 5: Solve for x
    x = 38,168,143,768.70/280,303.21
  6. Step 6: Final answer
    x = 136,167.34

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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.