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Finding the Fourth Proportional to 430.55, 644.59 and 386.03

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Solution

The fourth proportional to 430.55, 644.59 and 386.03 is: 577.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.55 : 644.59 = 386.03 : x
  2. Step 2: Convert to fraction form
    430.55/644.59 = 386.03/x
  3. Step 3: Cross multiply
    430.55x = 644.59 × 386.03
  4. Step 4: Simplify right side
    430.55x = 248,831.08
  5. Step 5: Solve for x
    x = 248,831.08/430.55
  6. Step 6: Final answer
    x = 577.94

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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.