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Finding the Fourth Proportional to 651.68, 899.40 and 418.72

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Solution

The fourth proportional to 651.68, 899.40 and 418.72 is: 577.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.68 : 899.40 = 418.72 : x
  2. Step 2: Convert to fraction form
    651.68/899.40 = 418.72/x
  3. Step 3: Cross multiply
    651.68x = 899.40 × 418.72
  4. Step 4: Simplify right side
    651.68x = 376,596.77
  5. Step 5: Solve for x
    x = 376,596.77/651.68
  6. Step 6: Final answer
    x = 577.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.