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Finding the Fourth Proportional to 438.95, 657.61 and 256.01

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Solution

The fourth proportional to 438.95, 657.61 and 256.01 is: 383.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.95 : 657.61 = 256.01 : x
  2. Step 2: Convert to fraction form
    438.95/657.61 = 256.01/x
  3. Step 3: Cross multiply
    438.95x = 657.61 × 256.01
  4. Step 4: Simplify right side
    438.95x = 168,354.74
  5. Step 5: Solve for x
    x = 168,354.74/438.95
  6. Step 6: Final answer
    x = 383.54

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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.