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Finding the Fourth Proportional to 510.72, 704.38 and 313.88

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Solution

The fourth proportional to 510.72, 704.38 and 313.88 is: 432.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.72 : 704.38 = 313.88 : x
  2. Step 2: Convert to fraction form
    510.72/704.38 = 313.88/x
  3. Step 3: Cross multiply
    510.72x = 704.38 × 313.88
  4. Step 4: Simplify right side
    510.72x = 221,090.79
  5. Step 5: Solve for x
    x = 221,090.79/510.72
  6. Step 6: Final answer
    x = 432.90

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1.5x scale

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.