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Finding the Fourth Proportional to 507.90, 760.98 and 430.80

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Solution

The fourth proportional to 507.90, 760.98 and 430.80 is: 645.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.90 : 760.98 = 430.80 : x
  2. Step 2: Convert to fraction form
    507.90/760.98 = 430.80/x
  3. Step 3: Cross multiply
    507.90x = 760.98 × 430.80
  4. Step 4: Simplify right side
    507.90x = 327,830.18
  5. Step 5: Solve for x
    x = 327,830.18/507.90
  6. Step 6: Final answer
    x = 645.46

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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.