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Finding the Fourth Proportional to 1,039.40, 1,437 and 790.32

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Solution

The fourth proportional to 1,039.40, 1,437 and 790.32 is: 1,092.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.40 : 1,437 = 790.32 : x
  2. Step 2: Convert to fraction form
    1,039.40/1,437 = 790.32/x
  3. Step 3: Cross multiply
    1,039.40x = 1,437 × 790.32
  4. Step 4: Simplify right side
    1,039.40x = 1,135,689.84
  5. Step 5: Solve for x
    x = 1,135,689.84/1,039.40
  6. Step 6: Final answer
    x = 1,092.64

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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.