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Finding the Fourth Proportional to 875.45, 1,208.31 and 580.76

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Solution

The fourth proportional to 875.45, 1,208.31 and 580.76 is: 801.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.45 : 1,208.31 = 580.76 : x
  2. Step 2: Convert to fraction form
    875.45/1,208.31 = 580.76/x
  3. Step 3: Cross multiply
    875.45x = 1,208.31 × 580.76
  4. Step 4: Simplify right side
    875.45x = 701,738.12
  5. Step 5: Solve for x
    x = 701,738.12/875.45
  6. Step 6: Final answer
    x = 801.57

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.