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Finding the Fourth Proportional to 602.47, 904.25 and 420

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Solution

The fourth proportional to 602.47, 904.25 and 420 is: 630.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.47 : 904.25 = 420 : x
  2. Step 2: Convert to fraction form
    602.47/904.25 = 420/x
  3. Step 3: Cross multiply
    602.47x = 904.25 × 420
  4. Step 4: Simplify right side
    602.47x = 379,785
  5. Step 5: Solve for x
    x = 379,785/602.47
  6. Step 6: Final answer
    x = 630.38

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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.