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Finding the Fourth Proportional to 485.56, 669.93 and 411.19

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Solution

The fourth proportional to 485.56, 669.93 and 411.19 is: 567.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.56 : 669.93 = 411.19 : x
  2. Step 2: Convert to fraction form
    485.56/669.93 = 411.19/x
  3. Step 3: Cross multiply
    485.56x = 669.93 × 411.19
  4. Step 4: Simplify right side
    485.56x = 275,468.52
  5. Step 5: Solve for x
    x = 275,468.52/485.56
  6. Step 6: Final answer
    x = 567.32

Related Problems

Find fourth proportional to 242.78, 334.97 and 205.60
Half scale
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Double scale
Find fourth proportional to 486.56, 671.31 and 412.19
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.