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Finding the Fourth Proportional to 632.76, 872.16 and 485.10

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Solution

The fourth proportional to 632.76, 872.16 and 485.10 is: 668.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.76 : 872.16 = 485.10 : x
  2. Step 2: Convert to fraction form
    632.76/872.16 = 485.10/x
  3. Step 3: Cross multiply
    632.76x = 872.16 × 485.10
  4. Step 4: Simplify right side
    632.76x = 423,084.82
  5. Step 5: Solve for x
    x = 423,084.82/632.76
  6. Step 6: Final answer
    x = 668.63

Related Problems

Find fourth proportional to 316.38, 436.08 and 242.55
Half scale
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Double scale
Find fourth proportional to 633.76, 873.54 and 486.10
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.