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Finding the Fourth Proportional to 510.40, 765.56 and 389.32

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Solution

The fourth proportional to 510.40, 765.56 and 389.32 is: 583.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.40 : 765.56 = 389.32 : x
  2. Step 2: Convert to fraction form
    510.40/765.56 = 389.32/x
  3. Step 3: Cross multiply
    510.40x = 765.56 × 389.32
  4. Step 4: Simplify right side
    510.40x = 298,047.82
  5. Step 5: Solve for x
    x = 298,047.82/510.40
  6. Step 6: Final answer
    x = 583.95

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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.