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Finding the Fourth Proportional to 651.95, 899.75 and 389.96

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Solution

The fourth proportional to 651.95, 899.75 and 389.96 is: 538.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.95 : 899.75 = 389.96 : x
  2. Step 2: Convert to fraction form
    651.95/899.75 = 389.96/x
  3. Step 3: Cross multiply
    651.95x = 899.75 × 389.96
  4. Step 4: Simplify right side
    651.95x = 350,866.51
  5. Step 5: Solve for x
    x = 350,866.51/651.95
  6. Step 6: Final answer
    x = 538.18

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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.