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Finding the Fourth Proportional to 651.52, 977.22 and 407.80

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Solution

The fourth proportional to 651.52, 977.22 and 407.80 is: 611.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.52 : 977.22 = 407.80 : x
  2. Step 2: Convert to fraction form
    651.52/977.22 = 407.80/x
  3. Step 3: Cross multiply
    651.52x = 977.22 × 407.80
  4. Step 4: Simplify right side
    651.52x = 398,510.32
  5. Step 5: Solve for x
    x = 398,510.32/651.52
  6. Step 6: Final answer
    x = 611.66

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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.