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Finding the Fourth Proportional to 904.21, 1,356.55 and 384.23

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Solution

The fourth proportional to 904.21, 1,356.55 and 384.23 is: 576.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.21 : 1,356.55 = 384.23 : x
  2. Step 2: Convert to fraction form
    904.21/1,356.55 = 384.23/x
  3. Step 3: Cross multiply
    904.21x = 1,356.55 × 384.23
  4. Step 4: Simplify right side
    904.21x = 521,227.21
  5. Step 5: Solve for x
    x = 521,227.21/904.21
  6. Step 6: Final answer
    x = 576.45

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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.