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Finding the Fourth Proportional to 1,309.39, 1,807.31 and 750.15

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Solution

The fourth proportional to 1,309.39, 1,807.31 and 750.15 is: 1,035.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.39 : 1,807.31 = 750.15 : x
  2. Step 2: Convert to fraction form
    1,309.39/1,807.31 = 750.15/x
  3. Step 3: Cross multiply
    1,309.39x = 1,807.31 × 750.15
  4. Step 4: Simplify right side
    1,309.39x = 1,355,753.60
  5. Step 5: Solve for x
    x = 1,355,753.60/1,309.39
  6. Step 6: Final answer
    x = 1,035.41

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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.