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Finding the Fourth Proportional to 651.51, 977.57 and 407.90

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Solution

The fourth proportional to 651.51, 977.57 and 407.90 is: 612.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.51 : 977.57 = 407.90 : x
  2. Step 2: Convert to fraction form
    651.51/977.57 = 407.90/x
  3. Step 3: Cross multiply
    651.51x = 977.57 × 407.90
  4. Step 4: Simplify right side
    651.51x = 398,750.80
  5. Step 5: Solve for x
    x = 398,750.80/651.51
  6. Step 6: Final answer
    x = 612.04

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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.