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Finding the Fourth Proportional to 430.93, 646.64 and 258.01

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Solution

The fourth proportional to 430.93, 646.64 and 258.01 is: 387.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.93 : 646.64 = 258.01 : x
  2. Step 2: Convert to fraction form
    430.93/646.64 = 258.01/x
  3. Step 3: Cross multiply
    430.93x = 646.64 × 258.01
  4. Step 4: Simplify right side
    430.93x = 166,839.59
  5. Step 5: Solve for x
    x = 166,839.59/430.93
  6. Step 6: Final answer
    x = 387.16

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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.