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Finding the Fourth Proportional to 976.20, 1,346.99 and 578.19

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Solution

The fourth proportional to 976.20, 1,346.99 and 578.19 is: 797.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.20 : 1,346.99 = 578.19 : x
  2. Step 2: Convert to fraction form
    976.20/1,346.99 = 578.19/x
  3. Step 3: Cross multiply
    976.20x = 1,346.99 × 578.19
  4. Step 4: Simplify right side
    976.20x = 778,813.26
  5. Step 5: Solve for x
    x = 778,813.26/976.20
  6. Step 6: Final answer
    x = 797.80

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.