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Finding the Fourth Proportional to 904.20, 1,356.30 and 539.40

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Solution

The fourth proportional to 904.20, 1,356.30 and 539.40 is: 809.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.20 : 1,356.30 = 539.40 : x
  2. Step 2: Convert to fraction form
    904.20/1,356.30 = 539.40/x
  3. Step 3: Cross multiply
    904.20x = 1,356.30 × 539.40
  4. Step 4: Simplify right side
    904.20x = 731,588.22
  5. Step 5: Solve for x
    x = 731,588.22/904.20
  6. Step 6: Final answer
    x = 809.10

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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.