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Finding the Fourth Proportional to 1,072.48, 1,478.10 and 740.92

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Solution

The fourth proportional to 1,072.48, 1,478.10 and 740.92 is: 1,021.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.48 : 1,478.10 = 740.92 : x
  2. Step 2: Convert to fraction form
    1,072.48/1,478.10 = 740.92/x
  3. Step 3: Cross multiply
    1,072.48x = 1,478.10 × 740.92
  4. Step 4: Simplify right side
    1,072.48x = 1,095,153.85
  5. Step 5: Solve for x
    x = 1,095,153.85/1,072.48
  6. Step 6: Final answer
    x = 1,021.14

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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.