Home / 280,258.20-420,384.54-128,412.24

Finding the Fourth Proportional to 280,258.20, 420,384.54 and 128,412.24

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Solution

The fourth proportional to 280,258.20, 420,384.54 and 128,412.24 is: 192,617.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,258.20 : 420,384.54 = 128,412.24 : x
  2. Step 2: Convert to fraction form
    280,258.20/420,384.54 = 128,412.24/x
  3. Step 3: Cross multiply
    280,258.20x = 420,384.54 × 128,412.24
  4. Step 4: Simplify right side
    280,258.20x = 53,982,520,442.77
  5. Step 5: Solve for x
    x = 53,982,520,442.77/280,258.20
  6. Step 6: Final answer
    x = 192,617.10

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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.