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Finding the Fourth Proportional to 651.60, 977.40 and 261.63

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Solution

The fourth proportional to 651.60, 977.40 and 261.63 is: 392.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.60 : 977.40 = 261.63 : x
  2. Step 2: Convert to fraction form
    651.60/977.40 = 261.63/x
  3. Step 3: Cross multiply
    651.60x = 977.40 × 261.63
  4. Step 4: Simplify right side
    651.60x = 255,717.16
  5. Step 5: Solve for x
    x = 255,717.16/651.60
  6. Step 6: Final answer
    x = 392.45

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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.