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Finding the Fourth Proportional to 1,189.12, 1,780.80 and 901.12

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Solution

The fourth proportional to 1,189.12, 1,780.80 and 901.12 is: 1,349.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.12 : 1,780.80 = 901.12 : x
  2. Step 2: Convert to fraction form
    1,189.12/1,780.80 = 901.12/x
  3. Step 3: Cross multiply
    1,189.12x = 1,780.80 × 901.12
  4. Step 4: Simplify right side
    1,189.12x = 1,604,714.50
  5. Step 5: Solve for x
    x = 1,604,714.50/1,189.12
  6. Step 6: Final answer
    x = 1,349.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.