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Finding the Fourth Proportional to 430.88, 646.25 and 138.40

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Solution

The fourth proportional to 430.88, 646.25 and 138.40 is: 207.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.88 : 646.25 = 138.40 : x
  2. Step 2: Convert to fraction form
    430.88/646.25 = 138.40/x
  3. Step 3: Cross multiply
    430.88x = 646.25 × 138.40
  4. Step 4: Simplify right side
    430.88x = 89,438.69
  5. Step 5: Solve for x
    x = 89,438.69/430.88
  6. Step 6: Final answer
    x = 207.57

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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.