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Finding the Fourth Proportional to 510.61, 765.92 and 145.40

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Solution

The fourth proportional to 510.61, 765.92 and 145.40 is: 218.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.61 : 765.92 = 145.40 : x
  2. Step 2: Convert to fraction form
    510.61/765.92 = 145.40/x
  3. Step 3: Cross multiply
    510.61x = 765.92 × 145.40
  4. Step 4: Simplify right side
    510.61x = 111,364.04
  5. Step 5: Solve for x
    x = 111,364.04/510.61
  6. Step 6: Final answer
    x = 218.10

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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.