Home / 1,621.15-2,430.30-961.40

Finding the Fourth Proportional to 1,621.15, 2,430.30 and 961.40

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Solution

The fourth proportional to 1,621.15, 2,430.30 and 961.40 is: 1,441.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.15 : 2,430.30 = 961.40 : x
  2. Step 2: Convert to fraction form
    1,621.15/2,430.30 = 961.40/x
  3. Step 3: Cross multiply
    1,621.15x = 2,430.30 × 961.40
  4. Step 4: Simplify right side
    1,621.15x = 2,336,490.42
  5. Step 5: Solve for x
    x = 2,336,490.42/1,621.15
  6. Step 6: Final answer
    x = 1,441.25

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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.