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Finding the Fourth Proportional to 485.46, 670.02 and 289.08

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Solution

The fourth proportional to 485.46, 670.02 and 289.08 is: 398.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.46 : 670.02 = 289.08 : x
  2. Step 2: Convert to fraction form
    485.46/670.02 = 289.08/x
  3. Step 3: Cross multiply
    485.46x = 670.02 × 289.08
  4. Step 4: Simplify right side
    485.46x = 193,689.38
  5. Step 5: Solve for x
    x = 193,689.38/485.46
  6. Step 6: Final answer
    x = 398.98

Related Problems

Find fourth proportional to 242.73, 335.01 and 144.54
Half scale
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Double scale
Find fourth proportional to 486.46, 671.40 and 290.08
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.