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Finding the Fourth Proportional to 922.32, 1,272.55 and 642.24

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Solution

The fourth proportional to 922.32, 1,272.55 and 642.24 is: 886.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.32 : 1,272.55 = 642.24 : x
  2. Step 2: Convert to fraction form
    922.32/1,272.55 = 642.24/x
  3. Step 3: Cross multiply
    922.32x = 1,272.55 × 642.24
  4. Step 4: Simplify right side
    922.32x = 817,282.51
  5. Step 5: Solve for x
    x = 817,282.51/922.32
  6. Step 6: Final answer
    x = 886.12

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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.