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Finding the Fourth Proportional to 1,113.10, 1,669.65 and 837.70

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Solution

The fourth proportional to 1,113.10, 1,669.65 and 837.70 is: 1,256.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.10 : 1,669.65 = 837.70 : x
  2. Step 2: Convert to fraction form
    1,113.10/1,669.65 = 837.70/x
  3. Step 3: Cross multiply
    1,113.10x = 1,669.65 × 837.70
  4. Step 4: Simplify right side
    1,113.10x = 1,398,665.81
  5. Step 5: Solve for x
    x = 1,398,665.81/1,113.10
  6. Step 6: Final answer
    x = 1,256.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.