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Finding the Fourth Proportional to 1,138.51, 1,707.36 and 651.70

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Solution

The fourth proportional to 1,138.51, 1,707.36 and 651.70 is: 977.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.51 : 1,707.36 = 651.70 : x
  2. Step 2: Convert to fraction form
    1,138.51/1,707.36 = 651.70/x
  3. Step 3: Cross multiply
    1,138.51x = 1,707.36 × 651.70
  4. Step 4: Simplify right side
    1,138.51x = 1,112,686.51
  5. Step 5: Solve for x
    x = 1,112,686.51/1,138.51
  6. Step 6: Final answer
    x = 977.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.