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Finding the Fourth Proportional to 896.40, 1,345.10 and 485.52

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Solution

The fourth proportional to 896.40, 1,345.10 and 485.52 is: 728.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.40 : 1,345.10 = 485.52 : x
  2. Step 2: Convert to fraction form
    896.40/1,345.10 = 485.52/x
  3. Step 3: Cross multiply
    896.40x = 1,345.10 × 485.52
  4. Step 4: Simplify right side
    896.40x = 653,072.95
  5. Step 5: Solve for x
    x = 653,072.95/896.40
  6. Step 6: Final answer
    x = 728.55

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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.