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Finding the Fourth Proportional to 520.80, 718.20 and 433.20

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Solution

The fourth proportional to 520.80, 718.20 and 433.20 is: 597.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.80 : 718.20 = 433.20 : x
  2. Step 2: Convert to fraction form
    520.80/718.20 = 433.20/x
  3. Step 3: Cross multiply
    520.80x = 718.20 × 433.20
  4. Step 4: Simplify right side
    520.80x = 311,124.24
  5. Step 5: Solve for x
    x = 311,124.24/520.80
  6. Step 6: Final answer
    x = 597.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.