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Finding the Fourth Proportional to 538.20, 811.62 and 530.91

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Solution

The fourth proportional to 538.20, 811.62 and 530.91 is: 800.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.20 : 811.62 = 530.91 : x
  2. Step 2: Convert to fraction form
    538.20/811.62 = 530.91/x
  3. Step 3: Cross multiply
    538.20x = 811.62 × 530.91
  4. Step 4: Simplify right side
    538.20x = 430,897.17
  5. Step 5: Solve for x
    x = 430,897.17/538.20
  6. Step 6: Final answer
    x = 800.63

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.