Home / 1,020.20-1,528.55-434.90

Finding the Fourth Proportional to 1,020.20, 1,528.55 and 434.90

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Solution

The fourth proportional to 1,020.20, 1,528.55 and 434.90 is: 651.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.20 : 1,528.55 = 434.90 : x
  2. Step 2: Convert to fraction form
    1,020.20/1,528.55 = 434.90/x
  3. Step 3: Cross multiply
    1,020.20x = 1,528.55 × 434.90
  4. Step 4: Simplify right side
    1,020.20x = 664,766.40
  5. Step 5: Solve for x
    x = 664,766.40/1,020.20
  6. Step 6: Final answer
    x = 651.60

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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.