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Finding the Fourth Proportional to 552.80, 824.96 and 430.40

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Solution

The fourth proportional to 552.80, 824.96 and 430.40 is: 642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.80 : 824.96 = 430.40 : x
  2. Step 2: Convert to fraction form
    552.80/824.96 = 430.40/x
  3. Step 3: Cross multiply
    552.80x = 824.96 × 430.40
  4. Step 4: Simplify right side
    552.80x = 355,062.78
  5. Step 5: Solve for x
    x = 355,062.78/552.80
  6. Step 6: Final answer
    x = 642.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.