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Finding the Fourth Proportional to 1,136.51, 1,568.40 and 664.30

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Solution

The fourth proportional to 1,136.51, 1,568.40 and 664.30 is: 916.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.51 : 1,568.40 = 664.30 : x
  2. Step 2: Convert to fraction form
    1,136.51/1,568.40 = 664.30/x
  3. Step 3: Cross multiply
    1,136.51x = 1,568.40 × 664.30
  4. Step 4: Simplify right side
    1,136.51x = 1,041,892.49
  5. Step 5: Solve for x
    x = 1,041,892.49/1,136.51
  6. Step 6: Final answer
    x = 916.74

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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.