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Finding the Fourth Proportional to 430.98, 646.39 and 157.20

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Solution

The fourth proportional to 430.98, 646.39 and 157.20 is: 235.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.98 : 646.39 = 157.20 : x
  2. Step 2: Convert to fraction form
    430.98/646.39 = 157.20/x
  3. Step 3: Cross multiply
    430.98x = 646.39 × 157.20
  4. Step 4: Simplify right side
    430.98x = 101,612.51
  5. Step 5: Solve for x
    x = 101,612.51/430.98
  6. Step 6: Final answer
    x = 235.77

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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.