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Finding the Fourth Proportional to 1,040.19, 1,435.28 and 620.39

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Solution

The fourth proportional to 1,040.19, 1,435.28 and 620.39 is: 856.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.19 : 1,435.28 = 620.39 : x
  2. Step 2: Convert to fraction form
    1,040.19/1,435.28 = 620.39/x
  3. Step 3: Cross multiply
    1,040.19x = 1,435.28 × 620.39
  4. Step 4: Simplify right side
    1,040.19x = 890,423.08
  5. Step 5: Solve for x
    x = 890,423.08/1,040.19
  6. Step 6: Final answer
    x = 856.02

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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.