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Finding the Fourth Proportional to 1,057.40, 1,459.38 and 808.24

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Solution

The fourth proportional to 1,057.40, 1,459.38 and 808.24 is: 1,115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.40 : 1,459.38 = 808.24 : x
  2. Step 2: Convert to fraction form
    1,057.40/1,459.38 = 808.24/x
  3. Step 3: Cross multiply
    1,057.40x = 1,459.38 × 808.24
  4. Step 4: Simplify right side
    1,057.40x = 1,179,529.29
  5. Step 5: Solve for x
    x = 1,179,529.29/1,057.40
  6. Step 6: Final answer
    x = 1,115.50

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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.