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Finding the Fourth Proportional to 815.49, 1,124.10 and 553.05

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Solution

The fourth proportional to 815.49, 1,124.10 and 553.05 is: 762.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.49 : 1,124.10 = 553.05 : x
  2. Step 2: Convert to fraction form
    815.49/1,124.10 = 553.05/x
  3. Step 3: Cross multiply
    815.49x = 1,124.10 × 553.05
  4. Step 4: Simplify right side
    815.49x = 621,683.51
  5. Step 5: Solve for x
    x = 621,683.51/815.49
  6. Step 6: Final answer
    x = 762.34

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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.