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Finding the Fourth Proportional to 1,069.40, 1,475.32 and 790.30

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Solution

The fourth proportional to 1,069.40, 1,475.32 and 790.30 is: 1,090.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.40 : 1,475.32 = 790.30 : x
  2. Step 2: Convert to fraction form
    1,069.40/1,475.32 = 790.30/x
  3. Step 3: Cross multiply
    1,069.40x = 1,475.32 × 790.30
  4. Step 4: Simplify right side
    1,069.40x = 1,165,945.40
  5. Step 5: Solve for x
    x = 1,165,945.40/1,069.40
  6. Step 6: Final answer
    x = 1,090.28

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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.