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Finding the Fourth Proportional to 569.21, 785.55 and 345.20

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Solution

The fourth proportional to 569.21, 785.55 and 345.20 is: 476.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.21 : 785.55 = 345.20 : x
  2. Step 2: Convert to fraction form
    569.21/785.55 = 345.20/x
  3. Step 3: Cross multiply
    569.21x = 785.55 × 345.20
  4. Step 4: Simplify right side
    569.21x = 271,167.93
  5. Step 5: Solve for x
    x = 271,167.93/569.21
  6. Step 6: Final answer
    x = 476.40

Related Problems

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Half scale
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Double scale
Find fourth proportional to 570.21, 786.93 and 346.20
Similar ratio
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1.5x scale

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.