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Finding the Fourth Proportional to 569.58, 855 and 407.40

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Solution

The fourth proportional to 569.58, 855 and 407.40 is: 611.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.58 : 855 = 407.40 : x
  2. Step 2: Convert to fraction form
    569.58/855 = 407.40/x
  3. Step 3: Cross multiply
    569.58x = 855 × 407.40
  4. Step 4: Simplify right side
    569.58x = 348,327
  5. Step 5: Solve for x
    x = 348,327/569.58
  6. Step 6: Final answer
    x = 611.55

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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.