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Finding the Fourth Proportional to 430.04, 641.53 and 418.28

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Solution

The fourth proportional to 430.04, 641.53 and 418.28 is: 623.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.04 : 641.53 = 418.28 : x
  2. Step 2: Convert to fraction form
    430.04/641.53 = 418.28/x
  3. Step 3: Cross multiply
    430.04x = 641.53 × 418.28
  4. Step 4: Simplify right side
    430.04x = 268,339.17
  5. Step 5: Solve for x
    x = 268,339.17/430.04
  6. Step 6: Final answer
    x = 623.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.