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Finding the Fourth Proportional to 602.55, 904.20 and 407.91

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Solution

The fourth proportional to 602.55, 904.20 and 407.91 is: 612.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.55 : 904.20 = 407.91 : x
  2. Step 2: Convert to fraction form
    602.55/904.20 = 407.91/x
  3. Step 3: Cross multiply
    602.55x = 904.20 × 407.91
  4. Step 4: Simplify right side
    602.55x = 368,832.22
  5. Step 5: Solve for x
    x = 368,832.22/602.55
  6. Step 6: Final answer
    x = 612.12

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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.