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Finding the Fourth Proportional to 651.93, 900.17 and 390.30

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Solution

The fourth proportional to 651.93, 900.17 and 390.30 is: 538.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.93 : 900.17 = 390.30 : x
  2. Step 2: Convert to fraction form
    651.93/900.17 = 390.30/x
  3. Step 3: Cross multiply
    651.93x = 900.17 × 390.30
  4. Step 4: Simplify right side
    651.93x = 351,334.40
  5. Step 5: Solve for x
    x = 351,334.40/651.93
  6. Step 6: Final answer
    x = 538.91

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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.