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Finding the Fourth Proportional to 651.04, 975.54 and 390.40

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Solution

The fourth proportional to 651.04, 975.54 and 390.40 is: 584.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.04 : 975.54 = 390.40 : x
  2. Step 2: Convert to fraction form
    651.04/975.54 = 390.40/x
  3. Step 3: Cross multiply
    651.04x = 975.54 × 390.40
  4. Step 4: Simplify right side
    651.04x = 380,850.82
  5. Step 5: Solve for x
    x = 380,850.82/651.04
  6. Step 6: Final answer
    x = 584.99

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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.