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Finding the Fourth Proportional to 530.70, 791.48 and 478.86

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Solution

The fourth proportional to 530.70, 791.48 and 478.86 is: 714.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.70 : 791.48 = 478.86 : x
  2. Step 2: Convert to fraction form
    530.70/791.48 = 478.86/x
  3. Step 3: Cross multiply
    530.70x = 791.48 × 478.86
  4. Step 4: Simplify right side
    530.70x = 379,005.72
  5. Step 5: Solve for x
    x = 379,005.72/530.70
  6. Step 6: Final answer
    x = 714.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.