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Finding the Fourth Proportional to 847.84, 1,271.56 and 430.96

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Solution

The fourth proportional to 847.84, 1,271.56 and 430.96 is: 646.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.84 : 1,271.56 = 430.96 : x
  2. Step 2: Convert to fraction form
    847.84/1,271.56 = 430.96/x
  3. Step 3: Cross multiply
    847.84x = 1,271.56 × 430.96
  4. Step 4: Simplify right side
    847.84x = 547,991.50
  5. Step 5: Solve for x
    x = 547,991.50/847.84
  6. Step 6: Final answer
    x = 646.34

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.