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Finding the Fourth Proportional to 285.10, 392.30 and 257.50

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Solution

The fourth proportional to 285.10, 392.30 and 257.50 is: 354.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.10 : 392.30 = 257.50 : x
  2. Step 2: Convert to fraction form
    285.10/392.30 = 257.50/x
  3. Step 3: Cross multiply
    285.10x = 392.30 × 257.50
  4. Step 4: Simplify right side
    285.10x = 101,017.25
  5. Step 5: Solve for x
    x = 101,017.25/285.10
  6. Step 6: Final answer
    x = 354.32

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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.