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Finding the Fourth Proportional to 1,157.40, 1,593.81 and 980.63

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Solution

The fourth proportional to 1,157.40, 1,593.81 and 980.63 is: 1,350.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.40 : 1,593.81 = 980.63 : x
  2. Step 2: Convert to fraction form
    1,157.40/1,593.81 = 980.63/x
  3. Step 3: Cross multiply
    1,157.40x = 1,593.81 × 980.63
  4. Step 4: Simplify right side
    1,157.40x = 1,562,929.93
  5. Step 5: Solve for x
    x = 1,562,929.93/1,157.40
  6. Step 6: Final answer
    x = 1,350.38

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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.