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Finding the Fourth Proportional to 983.48, 1,357.68 and 634.76

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Solution

The fourth proportional to 983.48, 1,357.68 and 634.76 is: 876.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.48 : 1,357.68 = 634.76 : x
  2. Step 2: Convert to fraction form
    983.48/1,357.68 = 634.76/x
  3. Step 3: Cross multiply
    983.48x = 1,357.68 × 634.76
  4. Step 4: Simplify right side
    983.48x = 861,800.96
  5. Step 5: Solve for x
    x = 861,800.96/983.48
  6. Step 6: Final answer
    x = 876.28

Related Problems

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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.