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Finding the Fourth Proportional to 945.84, 1,419.15 and 425.70

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Solution

The fourth proportional to 945.84, 1,419.15 and 425.70 is: 638.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.84 : 1,419.15 = 425.70 : x
  2. Step 2: Convert to fraction form
    945.84/1,419.15 = 425.70/x
  3. Step 3: Cross multiply
    945.84x = 1,419.15 × 425.70
  4. Step 4: Simplify right side
    945.84x = 604,132.16
  5. Step 5: Solve for x
    x = 604,132.16/945.84
  6. Step 6: Final answer
    x = 638.73

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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.