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Finding the Fourth Proportional to 402.55, 555.50 and 284.40

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Solution

The fourth proportional to 402.55, 555.50 and 284.40 is: 392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.55 : 555.50 = 284.40 : x
  2. Step 2: Convert to fraction form
    402.55/555.50 = 284.40/x
  3. Step 3: Cross multiply
    402.55x = 555.50 × 284.40
  4. Step 4: Simplify right side
    402.55x = 157,981.42
  5. Step 5: Solve for x
    x = 157,981.42/402.55
  6. Step 6: Final answer
    x = 392.46

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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.