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Finding the Fourth Proportional to 509.24, 702.08 and 420.40

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Solution

The fourth proportional to 509.24, 702.08 and 420.40 is: 579.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.24 : 702.08 = 420.40 : x
  2. Step 2: Convert to fraction form
    509.24/702.08 = 420.40/x
  3. Step 3: Cross multiply
    509.24x = 702.08 × 420.40
  4. Step 4: Simplify right side
    509.24x = 295,154.43
  5. Step 5: Solve for x
    x = 295,154.43/509.24
  6. Step 6: Final answer
    x = 579.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.