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Finding the Fourth Proportional to 1,349.72, 1,862.40 and 790.12

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Solution

The fourth proportional to 1,349.72, 1,862.40 and 790.12 is: 1,090.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,349.72 : 1,862.40 = 790.12 : x
  2. Step 2: Convert to fraction form
    1,349.72/1,862.40 = 790.12/x
  3. Step 3: Cross multiply
    1,349.72x = 1,862.40 × 790.12
  4. Step 4: Simplify right side
    1,349.72x = 1,471,519.49
  5. Step 5: Solve for x
    x = 1,471,519.49/1,349.72
  6. Step 6: Final answer
    x = 1,090.24

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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.