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Finding the Fourth Proportional to 1,129.57, 1,555.55 and 919.07

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Solution

The fourth proportional to 1,129.57, 1,555.55 and 919.07 is: 1,265.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.57 : 1,555.55 = 919.07 : x
  2. Step 2: Convert to fraction form
    1,129.57/1,555.55 = 919.07/x
  3. Step 3: Cross multiply
    1,129.57x = 1,555.55 × 919.07
  4. Step 4: Simplify right side
    1,129.57x = 1,429,662.08
  5. Step 5: Solve for x
    x = 1,429,662.08/1,129.57
  6. Step 6: Final answer
    x = 1,265.67

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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.