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Finding the Fourth Proportional to 1,036.76, 1,421.96 and 920.12

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Solution

The fourth proportional to 1,036.76, 1,421.96 and 920.12 is: 1,261.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.76 : 1,421.96 = 920.12 : x
  2. Step 2: Convert to fraction form
    1,036.76/1,421.96 = 920.12/x
  3. Step 3: Cross multiply
    1,036.76x = 1,421.96 × 920.12
  4. Step 4: Simplify right side
    1,036.76x = 1,308,373.84
  5. Step 5: Solve for x
    x = 1,308,373.84/1,036.76
  6. Step 6: Final answer
    x = 1,261.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.