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Finding the Fourth Proportional to 569.40, 851.76 and 478.20

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Solution

The fourth proportional to 569.40, 851.76 and 478.20 is: 715.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.40 : 851.76 = 478.20 : x
  2. Step 2: Convert to fraction form
    569.40/851.76 = 478.20/x
  3. Step 3: Cross multiply
    569.40x = 851.76 × 478.20
  4. Step 4: Simplify right side
    569.40x = 407,311.63
  5. Step 5: Solve for x
    x = 407,311.63/569.40
  6. Step 6: Final answer
    x = 715.33

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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.