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Finding the Fourth Proportional to 430.94, 646.25 and 156.95

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Solution

The fourth proportional to 430.94, 646.25 and 156.95 is: 235.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.94 : 646.25 = 156.95 : x
  2. Step 2: Convert to fraction form
    430.94/646.25 = 156.95/x
  3. Step 3: Cross multiply
    430.94x = 646.25 × 156.95
  4. Step 4: Simplify right side
    430.94x = 101,424.92
  5. Step 5: Solve for x
    x = 101,424.92/430.94
  6. Step 6: Final answer
    x = 235.36

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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.