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Finding the Fourth Proportional to 1,015.32, 1,400.76 and 642.16

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Solution

The fourth proportional to 1,015.32, 1,400.76 and 642.16 is: 885.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.32 : 1,400.76 = 642.16 : x
  2. Step 2: Convert to fraction form
    1,015.32/1,400.76 = 642.16/x
  3. Step 3: Cross multiply
    1,015.32x = 1,400.76 × 642.16
  4. Step 4: Simplify right side
    1,015.32x = 899,512.04
  5. Step 5: Solve for x
    x = 899,512.04/1,015.32
  6. Step 6: Final answer
    x = 885.94

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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.