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Finding the Fourth Proportional to 407.70, 607.77 and 391.32

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Solution

The fourth proportional to 407.70, 607.77 and 391.32 is: 583.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.70 : 607.77 = 391.32 : x
  2. Step 2: Convert to fraction form
    407.70/607.77 = 391.32/x
  3. Step 3: Cross multiply
    407.70x = 607.77 × 391.32
  4. Step 4: Simplify right side
    407.70x = 237,832.56
  5. Step 5: Solve for x
    x = 237,832.56/407.70
  6. Step 6: Final answer
    x = 583.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.