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Finding the Fourth Proportional to 920.10, 1,380.64 and 612.10

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Solution

The fourth proportional to 920.10, 1,380.64 and 612.10 is: 918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.10 : 1,380.64 = 612.10 : x
  2. Step 2: Convert to fraction form
    920.10/1,380.64 = 612.10/x
  3. Step 3: Cross multiply
    920.10x = 1,380.64 × 612.10
  4. Step 4: Simplify right side
    920.10x = 845,089.74
  5. Step 5: Solve for x
    x = 845,089.74/920.10
  6. Step 6: Final answer
    x = 918.48

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.