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Finding the Fourth Proportional to 434.16, 651.69 and 425.40

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Solution

The fourth proportional to 434.16, 651.69 and 425.40 is: 638.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.16 : 651.69 = 425.40 : x
  2. Step 2: Convert to fraction form
    434.16/651.69 = 425.40/x
  3. Step 3: Cross multiply
    434.16x = 651.69 × 425.40
  4. Step 4: Simplify right side
    434.16x = 277,228.93
  5. Step 5: Solve for x
    x = 277,228.93/434.16
  6. Step 6: Final answer
    x = 638.54

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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.