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Finding the Fourth Proportional to 931.76, 1,283.96 and 665.45

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Solution

The fourth proportional to 931.76, 1,283.96 and 665.45 is: 916.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.76 : 1,283.96 = 665.45 : x
  2. Step 2: Convert to fraction form
    931.76/1,283.96 = 665.45/x
  3. Step 3: Cross multiply
    931.76x = 1,283.96 × 665.45
  4. Step 4: Simplify right side
    931.76x = 854,411.24
  5. Step 5: Solve for x
    x = 854,411.24/931.76
  6. Step 6: Final answer
    x = 916.99

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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.