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Finding the Fourth Proportional to 510.72, 705.12 and 345.12

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Solution

The fourth proportional to 510.72, 705.12 and 345.12 is: 476.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.72 : 705.12 = 345.12 : x
  2. Step 2: Convert to fraction form
    510.72/705.12 = 345.12/x
  3. Step 3: Cross multiply
    510.72x = 705.12 × 345.12
  4. Step 4: Simplify right side
    510.72x = 243,351.01
  5. Step 5: Solve for x
    x = 243,351.01/510.72
  6. Step 6: Final answer
    x = 476.49

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Double scale
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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.