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Finding the Fourth Proportional to 430.65, 646.04 and 156.71

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Solution

The fourth proportional to 430.65, 646.04 and 156.71 is: 235.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.65 : 646.04 = 156.71 : x
  2. Step 2: Convert to fraction form
    430.65/646.04 = 156.71/x
  3. Step 3: Cross multiply
    430.65x = 646.04 × 156.71
  4. Step 4: Simplify right side
    430.65x = 101,240.93
  5. Step 5: Solve for x
    x = 101,240.93/430.65
  6. Step 6: Final answer
    x = 235.09

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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.