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Finding the Fourth Proportional to 874.40, 1,206.92 and 612.48

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Solution

The fourth proportional to 874.40, 1,206.92 and 612.48 is: 845.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.40 : 1,206.92 = 612.48 : x
  2. Step 2: Convert to fraction form
    874.40/1,206.92 = 612.48/x
  3. Step 3: Cross multiply
    874.40x = 1,206.92 × 612.48
  4. Step 4: Simplify right side
    874.40x = 739,214.36
  5. Step 5: Solve for x
    x = 739,214.36/874.40
  6. Step 6: Final answer
    x = 845.40

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.