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Finding the Fourth Proportional to 651.50, 899.08 and 389.42

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Solution

The fourth proportional to 651.50, 899.08 and 389.42 is: 537.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.50 : 899.08 = 389.42 : x
  2. Step 2: Convert to fraction form
    651.50/899.08 = 389.42/x
  3. Step 3: Cross multiply
    651.50x = 899.08 × 389.42
  4. Step 4: Simplify right side
    651.50x = 350,114.26
  5. Step 5: Solve for x
    x = 350,114.26/651.50
  6. Step 6: Final answer
    x = 537.40

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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.