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Finding the Fourth Proportional to 1,015.40, 1,400.61 and 642.26

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Solution

The fourth proportional to 1,015.40, 1,400.61 and 642.26 is: 885.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.40 : 1,400.61 = 642.26 : x
  2. Step 2: Convert to fraction form
    1,015.40/1,400.61 = 642.26/x
  3. Step 3: Cross multiply
    1,015.40x = 1,400.61 × 642.26
  4. Step 4: Simplify right side
    1,015.40x = 899,555.78
  5. Step 5: Solve for x
    x = 899,555.78/1,015.40
  6. Step 6: Final answer
    x = 885.91

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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.