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Finding the Fourth Proportional to 873.77, 1,315.82 and 631.98

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Solution

The fourth proportional to 873.77, 1,315.82 and 631.98 is: 951.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.77 : 1,315.82 = 631.98 : x
  2. Step 2: Convert to fraction form
    873.77/1,315.82 = 631.98/x
  3. Step 3: Cross multiply
    873.77x = 1,315.82 × 631.98
  4. Step 4: Simplify right side
    873.77x = 831,573.50
  5. Step 5: Solve for x
    x = 831,573.50/873.77
  6. Step 6: Final answer
    x = 951.71

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.