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Finding the Fourth Proportional to 852.36, 1,278.70 and 339.40

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Solution

The fourth proportional to 852.36, 1,278.70 and 339.40 is: 509.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.36 : 1,278.70 = 339.40 : x
  2. Step 2: Convert to fraction form
    852.36/1,278.70 = 339.40/x
  3. Step 3: Cross multiply
    852.36x = 1,278.70 × 339.40
  4. Step 4: Simplify right side
    852.36x = 433,990.78
  5. Step 5: Solve for x
    x = 433,990.78/852.36
  6. Step 6: Final answer
    x = 509.16

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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.