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Finding the Fourth Proportional to 1,265.79, 1,749.21 and 912.87

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Solution

The fourth proportional to 1,265.79, 1,749.21 and 912.87 is: 1,261.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.79 : 1,749.21 = 912.87 : x
  2. Step 2: Convert to fraction form
    1,265.79/1,749.21 = 912.87/x
  3. Step 3: Cross multiply
    1,265.79x = 1,749.21 × 912.87
  4. Step 4: Simplify right side
    1,265.79x = 1,596,807.89
  5. Step 5: Solve for x
    x = 1,596,807.89/1,265.79
  6. Step 6: Final answer
    x = 1,261.51

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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.