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Finding the Fourth Proportional to 1,351.40, 1,864.70 and 761.92

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Solution

The fourth proportional to 1,351.40, 1,864.70 and 761.92 is: 1,051.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.40 : 1,864.70 = 761.92 : x
  2. Step 2: Convert to fraction form
    1,351.40/1,864.70 = 761.92/x
  3. Step 3: Cross multiply
    1,351.40x = 1,864.70 × 761.92
  4. Step 4: Simplify right side
    1,351.40x = 1,420,749.47
  5. Step 5: Solve for x
    x = 1,420,749.47/1,351.40
  6. Step 6: Final answer
    x = 1,051.32

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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.