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Finding the Fourth Proportional to 1,128.84, 1,560.70 and 782.12

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Solution

The fourth proportional to 1,128.84, 1,560.70 and 782.12 is: 1,081.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.84 : 1,560.70 = 782.12 : x
  2. Step 2: Convert to fraction form
    1,128.84/1,560.70 = 782.12/x
  3. Step 3: Cross multiply
    1,128.84x = 1,560.70 × 782.12
  4. Step 4: Simplify right side
    1,128.84x = 1,220,654.68
  5. Step 5: Solve for x
    x = 1,220,654.68/1,128.84
  6. Step 6: Final answer
    x = 1,081.34

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Half scale
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Double scale
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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.