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Finding the Fourth Proportional to 1,916.80, 2,645.04 and 1,130.80

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Solution

The fourth proportional to 1,916.80, 2,645.04 and 1,130.80 is: 1,560.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.80 : 2,645.04 = 1,130.80 : x
  2. Step 2: Convert to fraction form
    1,916.80/2,645.04 = 1,130.80/x
  3. Step 3: Cross multiply
    1,916.80x = 2,645.04 × 1,130.80
  4. Step 4: Simplify right side
    1,916.80x = 2,991,011.23
  5. Step 5: Solve for x
    x = 2,991,011.23/1,916.80
  6. Step 6: Final answer
    x = 1,560.42

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Double scale
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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.